Long-time Slashdot reader fahrbot-bot shared this report from the New York Times: A decade ago, a band of astronomers set out to investigate one of the oldest questions taunting philosophers, scientists, priests, astronomers, mystics and the rest of the human race: How many more Earths are out there, if any? How many far-flung planets exist that could harbor life as we know it?

Their tool was the Kepler spacecraft, which was launched in March 2009 on a three-and-a-half year mission to monitor 150,000 stars in a patch of sky in the Milky Way. It looked for tiny dips in starlight caused by an exoplanet passing in front of its home star. "It's not E.T., but it's E.T.'s home," said William Borucki when the mission was launched in March 2009. It was Dr. Borucki, an astronomer now retired from NASA's Ames Research Center, who dreamed up the project and spent two decades convincing NASA to do it. Before the spacecraft finally gave out in 2018, it had discovered more than 4,000 candidate worlds among those stars. So far, none have shown any sign of life or habitation. (Granted, they are very far away and hard to study.) Extrapolated, that figure suggests that there are billions of exoplanets in the Milky Way galaxy. But how many of those are potentially habitable?

After crunching Kepler's data for two years, a team of 44 astronomers led by Steve Bryson of NASA Ames has landed on what they say is the definitive answer, at least for now. Their paper has been accepted for publication in the Astronomical Journal... The team calculated that at least one-third, and perhaps as many as 90 percent, of stars similar in mass and brightness to our sun have rocks like Earth in their habitable zones, with the range reflecting the researchers' confidence in their various methods and assumptions. That is no small bonanza, however you look at it.

According to NASA estimates there are at least 100 billion stars in the Milky Way, of which about 4 billion are sunlike. If only 7 percent of those stars have habitable planets — a seriously conservative estimate — there could be as many as 300 million potentially habitable Earths out there in the whole Milky Way alone.

On average, the astronomers calculated, the nearest such planet should be about 20 light-years away, and there should be four of them within 30 light-years or so of the sun...
"The new result means that the galaxy is at least twice as fertile as estimated in one of the first analyses of Kepler data, in 2013."

"Joe Biden, the projected winner of the U.S. presidency, will move to restore dozens of environmental safeguards President Donald Trump abolished," reports the Washington Post, "and launch the boldest climate change plan of any president in history."

destinyland shares their report: While some of Biden's most sweeping programs will encounter stiff resistance from Senate Republicans and conservative attorneys general, the United States is poised to make a 180-degree turn on climate change and conservation policy. Biden's team already has plans on how it will restrict oil and gas drilling on public lands and waters; ratchet up federal mileage standards for cars and SUVs; block pipelines that transport fossil fuels across the country; provide federal incentives to develop renewable power; and mobilize other nations to make deeper cuts in their own carbon emissions... Biden has vowed to eliminate carbon emissions from the electric sector by 2035 and spend $2 trillion on investments ranging from weatherizing homes to developing a nationwide network of charging stations for electric vehicles.

That massive investment plan stands a chance only if his party wins two Senate runoff races in Georgia in January; otherwise, he would have to rely on a combination of executive actions and more-modest congressional deals to advance his agenda.

Still, a number of factors make it easier to enact more-ambitious climate policies than even four years ago. Roughly 10% of the globe has warmed by 2 degrees Celsius (3.6 degrees Fahrenheit), a temperature rise the world has pledged to avoid. The price of solar and wind power has dropped, the coal industry has shrunk, and Americans increasingly connect the disasters they're experiencing in real time — including more-intense wildfires, hurricanes and droughts — with global warming. Biden has made the argument that curbing carbon will produce high-paying jobs while protecting the planet...

Some of the new administration's rules could be challenged in federal court, which have a number of Trump appointees on the bench. But even some conservative activists said that Biden could enact enduring policies, whether by partnering with Congress or through regulation... The new administration may be able to broker compromises with key industries that have experienced regulatory whiplash in the past decade, including the auto industry and power sector, while offering tax breaks for renewable energy that remain popular with both parties. And Biden can rebuild diplomatic alliances that will spur foreign countries to pursue more-ambitious carbon reductions...

Biden's advisers have said that they plan to elevate climate change as a priority in departments that have not always treated it as one, including the Transportation, State and Treasury departments. It will influence key appointments, affecting everything from overseas banking and military bases to domestic roads and farms.... Biden's pledge to achieve a carbon-free U.S. power sector within 15 years would mean the closing or revamping of nearly every coal- and gas-fired power plant around the country, and the construction of an unprecedented number of new wind turbines and solar farms. On top of that, engineers still need to devise a better way of storing energy when the sun is not shining or the wind is not blowing.

"If I were advising Biden on energy, my first three priorities would be storage, storage and storage," said Sen. Angus King, I-Maine, who worked in the alternative energy businesses before running for office.

Here's a good sign for alien hunters: More than 300 million worlds with similar conditions to Earth are scattered throughout the Milky Way galaxy. A new analysis [PDF] concludes that roughly half of the galaxy's sunlike stars host rocky worlds in habitable zones where liquid water could pool or flow over the planets' surfaces. From a report: "This is the science result we've all been waiting for," says Natalie Batalha, an astronomer with the University of California, Santa Cruz, who worked on the new study. The finding, which has been accepted for publication in the Astronomical Journal, pins down a crucial number in the Drake Equation. Devised by my father Frank Drake in 1961, the equation sets up a framework for calculating the number of detectable civilizations in the Milky Way. Now the first few variables in the formula -- including the rate of sunlike star formation, the fraction of those stars with planets, and the number of habitable worlds per stellar system -- are known. The number of sunlike stars with worlds similar to Earth "could have been one in a thousand, or one in a million -- nobody really knew," says Seth Shostak, an astronomer at the Search for Extraterrestrial Intelligence (SETI) Institute who was not involved with the new study.

Astronomers estimated the number of these planets using data from NASA's planet-hunting Kepler spacecraft. For nine years, Kepler stared at the stars and watched for the brief twinkles produced when orbiting planets blot out a portion of their star's light. By the end of its mission in 2018, Kepler had spotted some 2,800 exoplanets -- many of them nothing like the worlds orbiting our sun. But Kepler's primary goal was always to determine how common planets like Earth are. The calculation required help from the European Space Agency's Gaia spacecraft, which monitors stars across the galaxy. With Gaia's observations in hand, scientists were finally able to determine that the Milky Way is populated by hundreds of millions of Earth-size planets orbiting sunlike stars -- and that the nearest one is probably within 20 light-years of the solar system.

Most clocks are handled automatically by computers, points out Tora (Slashdot reader #65,882). So in lieu of daylight saving time, "what about shifting time each month, rather than twice a year?"

On Medium developer Brandon Gillespie offers the details of "Universal Solar Time." The clock is adjusted up by 10 minutes every month for the first six months, and then down by 10 minutes in the same manner, and can be offset by your timezone. The computerized systems can handle the time shift the same on the 1st...just like they currently do twice a year.

The benefit of such an automated system is the day cycle stays perceptibly the same — the sun is up roughly at the same period each day for any given month. While there are many challenges to such a system, such as what to do with all of the analog clocks, the advantages of a system like this should give all of the positive benefits of Daylight Savings, without the negative impact on a person's day.

"Its that time of year again," writes long-time Slashdot reader rufey: Millions of people around the world will be adjusting (or have already adjusted) their clocks... Over the years it is apparent that most people who have spoken about the twice-yearly clock change oppose it.

So I ask, why are we still changing clocks in the year 2020?
Long-time Slashdot reader thegreatbob believes the answer is: inertia. Personally, I am less opposed, and much more indifferent to its continued existence. One thing (arguably good) that it does do is provide distinct, specific temporal reference points that the gradual changing of seasons does not, by forcing people to take some sort of irregular action.

Do I think this in any way helps cancel out the harm caused by upsetting the sleep cycles of a huge portion of the population? Absolutely not.
But Slashdot reader Anonymouse Cowtard argues they're grateful for the time change — because "I was sick of the sun waking me at 5 a.m."

Since it is that time of year again, share your own thoughts in the comments.

And why do we keep setting our clocks back an hour?

NASA's Mars 2020 Perseverance rover mission has logged a lot of flight miles since being lofted skyward on July 30 -- 146.3 million miles (235.4 million kilometers) to be exact. Turns out that is exactly the same distance it has to go before the spacecraft hits the Red Planet's atmosphere like a 11,900 mph (19,000 kph) freight train on Feb. 18, 2021. From a report: "At 1:40 p.m. Pacific Time today, our spacecraft will have just as many miles in its metaphorical rearview mirror as it will out its metaphorical windshield," said Julie Kangas, a navigator working on the Perseverance rover mission at NASA's Jet Propulsion Laboratory in Southern California. "While I don't think there will be cake, especially since most of us are working from home, it's still a pretty neat milestone. Next stop, Jezero Crater." The Sun's gravitational influence plays a significant role in shaping not just spacecraft trajectories to Mars (as well as to everywhere else in the solar system), but also the relative movement of the two planets. So Perseverance's route to the Red Planet follows a curved trajectory rather than an arrow-straight path.

"Although we're halfway into the distance we need to travel to Mars, the rover is not halfway between the two worlds," Kangas explained. "In straight-line distance, Earth is 26.6 million miles [42.7 million kilometers] behind Perseverance and Mars is 17.9 million miles [28.8 million kilometers] in front." At the current distance, it takes 2 minutes, 22 seconds for a transmission to travel from mission controllers at JPL via the Deep Space Network to the spacecraft. By time of landing, Perseverance will have covered 292.5 million miles (470.8 million kilometers), and Mars will be about 130 million miles (209 million kilometers) away from Earth; at that point, a transmission will take about 11.5 minutes to reach the spacecraft.

Windows Central reports: Microsoft is preparing a major OS update for Windows 10 in 2021 that sources say will bring with it a significant design refresh to the Windows UI. I'm told that Microsoft is planning to update many top-level user interfaces such as the Start menu, Action Center, and even File Explorer, with refreshed modern designs, better animations, and new features. This UI project is codenamed "Sun Valley" internally and is expected to ship as part of the Windows 10 "Cobalt" release scheduled for the holiday 2021 season. Internal documentation describes the project as "reinvigorating" and modernizing the Windows desktop experience to keep up with customer expectation in a world driven by other modern and lightweight platforms.

Windows 10 has remained much the same these last few years, with little to no changes in its design or feature set. Many other platforms on the market have gone through entire redesigns or UI refreshes in the last five years, and while Windows 10 has gone through minor design iterations with the introduction of Fluent Design, we've not seen a significant refresh or rethinking of its UI. The Sun Valley project appears to be spearheaded by the Windows Devices and Experiences team, lead by Chief Product Officer Panos Panay, who took charge of said division back in February. Microsoft announced in May that the company would be "reinvesting" in Windows 10 in the 2021 timeframe, and my sources say that Sun Valley is the result of that reinvestment.

Using NASA's Chandra X-ray Observatory, astronomers have discovered that "gravitational redshift" exists in two stars orbiting each other in our galaxy about 29,000 light years (200,000 trillion miles) away from Earth. Gravitational redshifts, where light is shifted to redder colors because of gravity, "have tangible impacts on modern life, as scientists and engineers must take them into account to enable accurate positions for GPS," reports Phys.Org. From the report: The intriguing system known as 4U 1916-053 contains two stars in a remarkably close orbit. One is the core of a star that has had its outer layers stripped away, leaving a star that is much denser than the Sun. The other is a neutron star, an even denser object created when a massive star collapses in a supernova explosion. The neutron star (grey) is shown in this artist's impression at the center of a disk of hot gas pulled away from its companion (white star on left). These two compact stars are only about 215,000 miles apart, roughly the distance between the Earth and the Moon. While the Moon orbits our planet once a month, the dense companion star in 4U 1916-053 whips around the neutron star and completes a full orbit in only 50 minutes.

In the new work on 4U 1916-053, the team analyzed X-ray spectra -- that is, the amounts of X-rays at different wavelengths -- from Chandra. They found the characteristic signature of the absorption of X-ray light by iron and silicon in the spectra. In three separate observations with Chandra, the data show a sharp drop in the detected amount of X-rays close to the wavelengths where the iron or silicon atoms are expected to absorb the X-rays. One of the spectra showing absorption by iron -- the dips on the left and right -- is included in the main graphic. An additional graphic shows a spectrum with absorption by silicon. In both spectra the data are shown in grey and a computer model in red.

However, the wavelengths of these characteristic signatures of iron and silicon were shifted to longer, or redder wavelengths compared to the laboratory values found here on Earth (shown with the blue, vertical line for each absorption signature). The researchers found that the shift of the absorption features was the same in each of the three Chandra observations, and that it was too large to be explained by motion away from us. Instead they concluded it was caused by gravitational redshift. The article goes on to explain how gravitational redshifts connect with Einstein's General Theory Relativity: "As predicted by Einstein's theory, clocks under the force of gravity run at a slower rate than clocks viewed from a distant region experiencing weaker gravity. This means that clocks on Earth observed from orbiting satellites run at a slower rate. To have the high precision needed for GPS, this effect needs to be taken into account or there will be small differences in time that would add up quickly, calculating inaccurate positions..."

The findings have been published in the Astrophysical Journal.

As Voyager 2 moves farther and farther from the Sun, the density of space is increasing. "It's not the first time this density increase has been detected," notes SciencAlert. "Voyager 1, which entered interstellar space in 2012, detected a similar density gradient at a separate location." From the report: Voyager 2's new data show that not only was Voyager 1's detection legit, but that the increase in density may be a large-scale feature of the very local interstellar medium (VLIM). The Solar System's edge can be defined by a few different boundaries, but the one crossed by the Voyager probes is known as the heliopause, and it's defined by the solar wind.
[...]
One theory is that the interstellar magnetic field lines become stronger as they drape over the heliopause. This could generate an electromagnetic ion cyclotron instability that depletes the plasma from the draping region. Voyager 2 did detect a stronger magnetic field than expected when it crossed the heliopause. Another theory is that material blown by the interstellar wind should slow as it reaches the heliopause, causing a sort of traffic jam. This has possibly been detected by outer Solar System probe New Horizons, which in 2018 picked up the faint ultraviolet glow resulting from a buildup of neutral hydrogen at the heliopause. It's also possible that both explanations play a role. Future measurements taken by both Voyager probes as they continue their journey out into interstellar space could help figure it out. But that might be a long bet to take. The findings have been published in The Astrophysical Journal Letters.

"Astrobiologists have identified 24 exoplanets that aren't just potentially habitable, they're potentially superhabitable, exhibiting an array of conditions more suitable to life than what's seen on Earth..." reports Gizmodo: For exoplanets to be superhabitable, they should be older, larger, heavier, warmer, and wetter compared to Earth, and ideally located around stars with longer lifespans than our own. So yeah, not only is Earth inferior, so too is our Sun, according to the new research...

As the new study points out, planets marginally older than Earth have a greater chance of being more habitable. When planets get old, "exhaustion of internally generated heat may result in eventual cooling, with consequences for global temperatures and atmospheric composition," write the authors. Earth is 4.5 billion years old, but planets between the ages of 5 billion and 8 billion years are likely to be more habitable, simply from a probabilistic standpoint...

To be clear, many of the criteria, such as atmospheric oxygen, plate tectonics, geomagnetism, and natural satellites, are currently beyond our ability to detect. What's more, only two of these planets, Kepler 1126 b and Kepler-69c, are scientifically validated planets, the remainder being on the list of unconfirmed Kepler Objects of Interest. Consequently, some of these "exoplanets" might not even be planets at all...

There are other limitations to consider as well. The authors are naturally biased towards Earth-like conditions, given that our planet provides the only known example of habitability. Life may proliferate under conditions not yet understood, and it's important to keep that in mind... We also don't know about the potential knock-off effects of these conditions. They sound good on paper, but the reality could be vastly different, as these environmental characteristics could collectively result in conditions wholly unsuitable for life.
"What's useful here is the criteria for planets that may not look exactly like Earth, but could be even more awesome locations for life," writes CNET.

"This could help us direct the resources of next-generation space telescopes like NASA's much-delayed James Webb."

Long-time Slashdot reader fahrbot-bot quotes Quanta magazine: It was an old idea of Stephen Hawking's: Unseen "primordial" black holes might be the hidden dark matter. It fell out of favor for decades, but a new series of studies has shown how the theory can work...

Their very blackness makes it hard to estimate how many black holes inhabit the cosmos and how big they are. So it was a genuine surprise when the first gravitational waves thrummed through detectors at the Laser Interferometer Gravitational-Wave Observatory (LIGO) in September 2015. Previously, the largest star-size black holes had topped out at around 20 times the mass of the sun. These new ones were about 30 solar masses each — not inconceivable, but odd. Moreover, once LIGO turned on and immediately started hearing these sorts of objects merge with each other, astrophysicists realized that there must be more black holes lurking out there than they had thought. Maybe a lot more.

The discovery of these strange specimens breathed new life into an old idea — one that had, in recent years, been relegated to the fringe. We know that dying stars can make black holes. But perhaps black holes were also born during the Big Bang itself. A hidden population of such "primordial" black holes could conceivably constitute dark matter, a hidden thumb on the cosmic scale...

Following a flurry of recent papers, the primordial black hole idea appears to have come back to life. In one of the latest, published last week in the Journal of Cosmology and Astroparticle Physics, Karsten Jedamzik, a cosmologist at the University of Montpellier, showed how a large population of primordial black holes could result in collisions that perfectly match what LIGO observes. "If his results are correct — and it seems to be a careful calculation he's done — that would put the last nail in the coffin of our own calculation," said Ali-Haïmoud, who has continued to play with the primordial black hole idea in subsequent papers too. "It would mean that in fact they could be all the dark matter."

"It's exciting," said Christian Byrnes, a cosmologist at the University of Sussex who helped inspire some of Jedamzik's arguments. "He's gone further than anyone has gone before...." And with every subsequent observing run, LIGO has increased its sensitivity, allowing it to eventually either find such small black holes or set strict limits on how many can exist. "This is not one of these stories like string theory, where in a decade or three decades we might still be discussing if it's correct," Byrnes said.

An anonymous reader quotes Teslarati: On August 19th this year, astronomers using the Panoramic Survey Telescope and Rapid Response System observatory in Hawaii spotted an object destined to enter Earth orbit this fall. Designated as object 2020 SO, the item is now believed to be a rocket booster from NASA's Surveyor 2 mission which crash landed on the Moon in 1966 during the Apollo-era of the Cold War's space race.

"I suspect this newly discovered object 2020 SO to be an old rocket booster because it is following an orbit about the Sun that is extremely similar to Earth's, nearly circular, in the same plane, and only slightly farther away the Sun at its farthest point," Dr. Paul Chodas, the director of NASA's Center for Near Earth Object Studies, explained in comments to CNN.

"That's precisely the kind of orbit that a rocket stage separated from a lunar mission would follow, once it passes by the Moon and escapes into orbit about the Sun. It's unlikely that an asteroid could have evolved into an orbit like this, but not impossible," he said. This specific type of event has only happened once before, namely in 2002 with a Saturn V upper stage from Apollo 12, according to Dr. Chodas.

The supermassive black hole at the center of the M87 galaxy has a shadow crescent that moves, like a dancer in the dark. From a report: Over a year ago, scientists unleashed something incredible on the world: the first photo of a black hole ever taken. By putting together radio astronomy observations made with dishes across four continents, the collaboration known as the Event Horizon Telescope managed to peer 53 million light-years away and look at a supermassive black hole, which is 6.5 million times the mass of the sun and sits at the center of the galaxy Messier 87 (M87). The fiery historic image showed off a bright crescent of ultra-hot gas and debris orbiting the black hole's event horizon, the pitch-black central point-of-no-return that traps anything that goes over, even light. The EHT team had just made one of the most impressive achievements in the history of astronomy, but this was only the beginning. On Wednesday, members of the EHT collaboration published new findings in the Astrophysical Journal about M87's supermassive black hole (known as M87*), revealing two new major insights.

First, the shadow diameter of the event horizon doesn't change over time, which is exactly what Einstein's theory of general relativity predicts for a supermassive black hole of M87*'s size. However, the second insight is that the bright crescent adorning this shadow is far from stable: it wobbles. There's so much turbulent matter surrounding M87* that it makes sense the crescent would bug out and get fidgety. But the fact that we can watch it over time means we now have an established method for studying the physics of one of the most extreme kinds of environment in the entire universe.

ZDNet reports: Oracle has released version 15 of Java, the language created 25 years ago by James Gosling at Sun Microsystems, which Oracle snapped up in 2009 for about $7.4bn to gain what it said was the "most important software Oracle has ever acquired". Java 15, or Oracle Java Development Kit (JDK) 15, brings the Edwards-Curve digital signature algorithm, hidden classes, and former preview features that have been finalized, including text blocks, and the Z Garbage Collector, while the sealed-classes feature arrives and pattern matching and records emerge as a second preview...

In July, Java fell out of RedMonk's top two positions for the first time since 2012 and now resides behind JavaScript and Python in terms of popularity. Tiobe in September ranked Java in second position, behind C and ahead of Python.... But Java is still hugely popular and widely used in the enterprise, according to Oracle, which notes it is used by over 69% of full-time developers worldwide... It counts Arm, Amazon, IBM, Intel, NTT Data, Red Hat, SAP and Tencent among its list of notable contributors to JDK 15. Oracle also gave a special mention to Microsoft and cloud system monitoring service DataDog for fixes...

As part of Java's 25th anniversary, Oracle commissioned analyst firm Omdia to assess its six-month release strategy for Java and whether it would be enough to keep millions of Java developers away from memory-safe alternatives such as Kotlin, the language Google has endorsed for Android development, and Rust, a system programming language that was created at Mozilla. "In Omdia's opinion, the work Oracle began a few years ago in moving to a six-month update cycle and introducing a new level of modularity, puts the vendor in good stead with its constituency of approximately 12 million developers," Oracle said in its report on Omdia's analysis.

"However, Oracle and the Java programming language need an ongoing series of innovative, must-have, and 'delightful' features that make the language even more user friendly and cloud capable. These will keep existing Java developers happy while steering potential Java developers away from newer languages like Rust and Kotlin."

There is something funky going on in the clouds of Venus. Telescopes have detected unusually high concentrations of the molecule phosphine -- a stinky, flammable chemical typically associated with feces, farts and rotting microbial activity -- in an atmospheric layer far above the planet's scorching surface. From a report: The finding is curious because here on Earth, phosphine is essentially always associated with living creatures, either as a by-product of metabolic processes or of human technology such as industrial fumigants and methamphetamine labs. Although toxic to many organisms, the molecule has been singled out as a potentially unambiguous signature of life because it is so difficult to make through ordinary geological or atmospheric action. Swathed in sulfuric acid clouds and possessing oppressive surface pressures and temperatures hot enough to melt lead, Venus is a hellish world. But the particular cloud layer where the phosphine is present happens to be relatively balmy, with ample sunlight and Earth-like atmospheric pressure and temperature. The results will have to be carefully vetted by the scientific community. Yet they seem likely to spark renewed interest in exploring our sister planet next door.

"It's a really puzzling discovery because phosphine doesn't fit in our conception of what kinds of chemicals should be in Venus's atmosphere," says Michael Wong, an astrobiologist at the University of Washington. Planetary scientist Sanjay Limaye of the University of Wisconsin-Madison agrees. "The bottom line is we don't know what's going on," he says. (Neither Wong nor Sanjay were involved in the work.) After the sun and moon, Venus is the brightest object visible to the naked eye in Earth's sky. For thousands of years, people told stories about the glittering jewel that appeared around sunrise and sunset. Venus's brilliance is what made it attractive to Jane Greaves, a radio astronomer at Cardiff University in England. She typically focuses her attention on distant newborn planetary systems but wanted to test her molecular identification abilities on worlds within our cosmic backyard. In 2017 Greaves observed Venus with the James Clerk Maxwell Telescope (JCMT) on Mauna Kea in Hawaii, searching for bar code-like patterns of lines in the planet's spectrum that would indicate the presence of different chemicals. While doing so, she noticed a line associated with phosphine. The data suggested the molecule was present at around 20 parts per billion in the planet's atmosphere, a concentration between 1,000 and a million times greater than that in Earth's atmosphere. "I was stunned," Greaves says. Further reading: The original paper in the journal Nature Astronomy; and the case for life on Venus.

A few months after Microsoft pledged to undo by 2050 the climate harm it's done to the atmosphere by emitting carbon dioxide into the atmosphere, Google said it's already done so. "We have eliminated Google's entire carbon legacy," Chief Executive Sundar Pichai said Monday in a blog post. From a report: Carbon dioxide, which can trap heat from the sun in the earth's atmosphere in a process called the greenhouse effect, is a key part of climate change problems humans are causing on the planet. Google said it became carbon neutral in 2007, meaning it offset carbon emissions related to its operations. That's typically done by purchasing "carbon offsets," actions like planting trees, but carbon offsets are a complex and sometimes shady business. The search and Android giant reversed its carbon footprint by buying "high-quality" carbon offsets, Pichai said. Carbon emissions are a major issue for companies seeking to become more environmentally responsible. Google has long pushed for sustainable operations. That's easier at a profitable tech giant, though, than at a more conventional business.

"Astrophysicists have recently begun hatching plans to find out just how weird Planet Nine might be," reports the New York Times. Long-time Slashdot reader fahrbot-bot shares their report: Although it is probably wishful thinking, some astronomers contend that a black hole may be lurking in the outer reaches of our solar system. All summer, they have been arguing over how to find it, if indeed it is there, and what to do about it, proposing plans that are only halfway out of this world...

Earlier this year, Edward Witten, a theoretical physicist at the Institute for Advanced Study in Princeton, chimed in... Dr. Witten suggested borrowing a trick from Breakthrough Starshot, the proposal by Russian philanthropist Yuri Milner and Dr. Hawking to send thousands of laser-propelled microscopic probes to the nearest star system, Alpha Centauri. Dr. Witten suggested sending hundreds of similarly small probes outward in all directions to explore the solar system. By keeping track of incoming signals from the probes, scientists on Earth would be able to tell if and when each one sped up or slowed down as it encountered the gravitational field of Planet Nine or anything else out there.

Key to this plan would be the ability of the probes to keep pinging Earth precisely every hundred-thousandth of a second. In May, astronomers Scott Lawrence and Zeeve Rogoszinski of the University of Maryland suggested instead monitoring the trajectories of the probes with high-resolution radio telescopes, which would obviate the need for high-precision clocks on the probes.
Another idea came from Avi Loeb, chair of the astronomy department at Harvard and leader of a scientific advisory board for Breakthrough Starshot: in July Dr. Loeb was back, with a student, Amir Siraj, and a new idea for finding the Planet Nine black hole. If a black hole were out there, they argued, it would occasionally rip apart small comets, causing bright flares that could soon be spotted by the new Vera C. Rubin Observatory, previously known as the Large Synoptic Survey Telescope, now under construction in Chile. The observatory's mission, starting in 2021, is to make a movie of the universe, producing a panorama of the entire southern night sky every few days and revealing anything that has changed or moved. Such flares should occur a few times a year, they noted. "Our calculations show that the flares will be bright enough for the Vera Rubin Observatory to rule out or confirm Planet Nine as a black hole within one year of monitoring the sky with its L.S.S.T. survey," Dr. Loeb wrote in an email.

Moreover, because the Rubin telescope examines such a large swath of sky, it could detect or rule out black holes of similar size all the way out to the Oort cloud, a vague and diffuse assemblage of protocomets and primordial, frozen riffraff a trillion miles from the sun, they said.

The prospect of finding a black hole in our own solar system "is as startling as finding evidence that someone might be living in the shed in your backyard," Dr. Loeb said in the email. "If so, who is it, and how did it get there?"

A reader shares some news from Sweden's Linköping University: The Earth receives many times more energy from the sun than we humans can use. This energy is absorbed by solar energy facilities, but one of the challenges of solar energy is to store it efficiently, such that the energy is available when the sun is not shining. This led scientists at Linköping University to investigate the possibility of capturing and storing solar energy in a new molecule.

"Our molecule can take on two different forms: a parent form that can absorb energy from sunlight, and an alternative form in which the structure of the parent form has been changed and become much more energy-rich, while remaining stable. This makes it possible to store the energy in sunlight in the molecule efficiently", says Bo Durbeej, professor of computational physics in the Department of Physics, Chemistry and Biology at LinkÃping University, and leader of the study...

It's common in research that experiments are done first and theoretical work subsequently confirms the experimental results, but in this case the procedure was reversed. Bo Durbeej and his group work in theoretical chemistry, and conduct calculations and simulations of chemical reactions. This involves advanced computer simulations, which are performed on supercomputers at the National Supercomputer Centre, NSC, in Linköping. The calculations showed that the molecule the researchers had developed would undergo the chemical reaction they required, and that it would take place extremely fast, within 200 femtoseconds. Their colleagues at the Research Centre for Natural Sciences in Hungary were then able to build the molecule, and perform experiments that confirmed the theoretical prediction...

"Most chemical reactions start in a condition where a molecule has high energy and subsequently passes to one with a low energy. Here, we do the opposite — a molecule that has low energy becomes one with high energy. We would expect this to be difficult, but we have shown that it is possible for such a reaction to take place both rapidly and efficiently", says Bo Durbeej.

The researchers will now examine how the stored energy can be released from the energy-rich form of the molecule in the best way...

Object-oriented programming "has been wildly successful. But was the success just a coincidence?" asks Stack Overflow's blog: Asking why so many widely-used languages are OOP might be mixing up cause and effect. Richard Feldman argues in his talk that it might just be coincidence. C++ was developed in the early 1980s by Bjarne Stroustrup, initially as a set of extensions to the C programming language. Building on C , C++ added object orientation but Feldman argues it became popular for the overall upgrade from C including type-safety and added support for automatic resource management, generic programming, and exception handling, among other features.

Then Java wanted to appeal to C++ programmers and doubled down on the OOP part. Ultimately, Sun Microsystems wanted to repeat the C++ trick by aiming for greatest familiarity for developers adopting Java. Millions of developers quickly moved to Java due to its exclusive integration in web browsers at the time. Seen this way, OOP seems to just be hitching a ride, rather than driving the success.
While acknowledging OOP cornerstones like encapsulation, inheritance, polymorphism, the article still takes a skeptical stance. "Seems like in 2020, there is not so much that OOP can do that other programming paradigms cannot, and a good programmer will use strategies from multiple paradigms together in the battle against complexity."

Citizen scientists have spotted almost 100 of our sun's nearest neighbors. Space.com reports: In a new study, members of the public -- including both professional scientists and volunteers -- discovered 95 brown dwarfs (celestial objects too big to be considered planets and too small to be considered stars) near our sun through the NASA-funded citizen science project Backyard Worlds: Planet 9. They made this discovery with the help of astronomers using the National Science Foundations National Optical-Infrared Astronomy Research Laboratory. Brown dwarfs are unusual celestial objects -- much heavier than planets but not massive enough to become stars. The celestial objects can be seriously hot (think thousands of degrees Fahrenheit), but these 95 newly-discovered neighbors are surprisingly cool. Some of these weird worlds are even relatively close to Earth's temperature and could be cool enough to have water clouds in their atmospheres, according to the statement.