On October 19, 2017, astronomers at the University of Hawaii spotted a strange object travelling through our solar system, which they later described as "a red and extremely elongated asteroid." It was the first interstellar object to be detected within our solar system; the scientists named it 'Oumuamua, the Hawaiian word for a scout or messenger. The following October, Avi Loeb, the chair of Harvard's astronomy department, co-wrote a paper (with a Harvard postdoctoral fellow, Shmuel Bialy) that examined 'Oumuamua's "peculiar acceleration" and suggested that the object "may be a fully operational probe sent intentionally to Earth's vicinity by an alien civilization." Loeb has long been interested in the search for extraterrestrial life, and he recently made further headlines by suggesting that we might communicate with the civilization that sent the probe.

Isaac Chotiner of The New Yorker has interviewed Loeb, who was frustrated that scientists saw 'Oumuamua too late in its journey to photograph the object. "My motivation for writing the paper is to alert the community to pay a lot more attention to the next visitor," he told Chotiner. An excerpt from the interview: The New Yorker: Your explanation of why 'Oumuamua might be an interstellar probe may be hard for laypeople to understand. Why might this be the case, beyond the fact that lots of things are possible?
Loeb: There is a Scientific American article I wrote where I summarized six strange facts about 'Oumuamua. The first one is that we didn't expect this object to exist in the first place. We see the solar system and we can calculate at what rate it ejected rocks during its history. And if we assume all planetary systems around other stars are doing the same thing, we can figure out what the population of interstellar objects should be. That calculation results in a lot of possibilities, but the range is much less than needed to explain the discovery of 'Oumuamua.
There is another peculiar fact about this object. When you look at all the stars in the vicinity of the sun, they move relative to the sun, the sun moves relative to them, but only one in five hundred stars in that frame is moving as slow as 'Oumuamua. You would expect that most rocks would move roughly at the speed of the star they came from. If this object came from another star, that star would have to be very special.

[...]The New Yorker: Hold on. "'Not where is the lack of evidence so that I can fit in any hypothesis that I like?' " [Bailer-Jones, of the Max Planck Institute for Astronomy, in Heidelberg, Germany, has identified four possible home stars for 'Oumuamua, and was asked to respond to Loeb's light-sail theory by NBC.]
Loeb: Well, it's exactly the approach that I took. I approached this with a scientific mind, like I approach any other problem in astronomy or science that I work on. The point is that we follow the evidence, and the evidence in this particular case is that there are six peculiar facts. And one of these facts is that it deviated from an orbit shaped by gravity while not showing any of the telltale signs of cometary outgassing activity. So we don't see the gas around it, we don't see the cometary tail. It has an extreme shape that we have never seen before in either asteroids or comets. We know that we couldn't detect any heat from it and that it's much more shiny, by a factor of ten, than a typical asteroid or comet. All of these are facts. I am following the facts.

Last year, I wrote a paper about cosmology where there was an unusual result, which showed that perhaps the gas in the universe was much colder than we expected. And so we postulated that maybe dark matter has some property that makes the gas cooler. And nobody cares, nobody is worried about it, no one says it is not science. Everyone says that is mainstream -- to consider dark matter, a substance we have never seen. That's completely fine. It doesn't bother anyone. But when you mention the possibility that there could be equipment out there that is coming from another civilization -- which, to my mind, is much less speculative, because we have already sent things into space -- then that is regarded as unscientific. But we didn't just invent this thing out of thin air. The reason we were driven to put in that sentence was because of the evidence, because of the facts. If someone else has a better explanation, they should write a paper about it rather than just saying what you said.

Yesterday, the Key West City Commission unanimously voted to ban the sale of sunscreens that contain two ingredients -- oxybenzone and octinoxate -- that a growing body of scientific evidence says harm coral reefs. The measure must now be reviewed again by the commission before it becomes law. The second vote is scheduled for February 5th. Miami Herald reports: Environmental researchers have published studies showing how these two ingredients, which accumulate in the water from bathers or from wastewater discharges, can damage coral reefs through bleaching and harming the corals' DNA. In some instances, the corals can die. A Feburary 2016 study in the Archives of Environmental Contamination and Toxicology examining the impact of oxybenzone in corals in Hawaii and the U.S. Virgin Islands concluded that the sunscreen ingredient "poses a hazard to coral reef conservation and threatens the resiliency of coral reefs to climate change.''

Last year, Hawaii banned the sale or distribution of any sunscreens containing oxybenzone and octinoxate, a measure that will go into effect on Jan. 1, 2021. It was the first state in the nation to implement such a ban. In Florida, the website for the South Florida Reef Ambassador Initiative, which falls under the state's Department of Environmental Protection, tells divers to "Avoid sunscreens with Oxybenzone and Avobenzone. The benzones are compounds that are lethal to coral reproduction in very small amounts." Experts who have studied the issue say sunscreens with zinc oxide or titanium dioxide, which are minerals, also block ultraviolet rays. They create a barrier on the skin that deflect the sun's rays .

"Researchers from the University of Houston have reported a new theory in physics called stress localization, which they used to tune and predict the properties of new materials," reports Phys.Org. "Based on those predictions, the researchers reported in Materials Horizons that they have created a durable silicone polymer coating capable of repelling ice from any surface." The new research has huge implications for aircraft, power transmission lines, and more. From the report: Hadi Ghasemi, Bill D. Cook Assistant Professor of mechanical engineering at UH and corresponding author for the work, said the findings suggest a way to take trial and error out of the search for new materials, in keeping with the movement of materials science toward a physics-driven approach. "You put in the properties you want, and the principle will tell you what material you need to synthesize," he said, noting that the concept can also be used to predict materials with superb antibacterial or other desirable properties.

The new material uses elastic energy localization where ice meets the material, triggering cracks at the interface that slough off the ice. Ghasemi said it requires minimal force to cause the cracks; the flow of air over the surface of an airplane acts as a trigger, for example. The material, which is applied as a spray, can be used on any surface, and Ghasemi said testing showed it is not only mechanically durable and unaffected by ultraviolet rays -- important for aircraft which face constant sun exposure -- but also does not change the aircraft's aerodynamic performance. Testing indicates it will last for more than 10 years, with no need to reapply, he said.

H. Peter Soyer, Professor of Dermatology, and Katie Lee, Research assistant at The University of Queensland, write: There's a lot to be said for sunshine -- both good and bad. It's our main source of vitamin D, which is essential for bone and muscle health. Populations with higher levels of sun exposure also have better blood pressure and mood levels, and fewer autoimmune diseases such as multiple sclerosis. On the other hand, excess UV exposure is estimated to contribute to 95% of melanomas and 99% of non-melanoma skin cancers. These skin cancers account for a whopping 80% of all new cancers each year in Australia.

Like any medicine, the dose counts. And in Australia, particularly in the summer, our dose of UV is so high that even short incidental exposures -- like while you hang out the washing or walk from your carpark into the shops -- adds up to huge lifetime doses. Fortunately, when it comes to tanning, the advice is clear: don't. A UV dose that's high enough to induce a tan is already much higher than the dose needed for vitamin D production. A four-year-long study of 1,113 people in Nambour, Queensland, found no difference in vitamin D levels between sunscreen users and sunscreen avoiders. Further reading: Is Sunscreen the New Margarine?

Tesla is proposing ways to modernize the electric grid of Greece's many islands in the Mediterranean sea with microgrids and renewable energy to reduce their dependence on fossil fuels. "Several Greek islands are relatively remote and rely heavily on fossil fuels to power their electric grid," notes Electrek. From the report: The Greek Minister of Environment and Energy, Mr. George Stathakis, confirmed last week that they have met with Tesla to discuss the deployment of microgrids in Greek islands. They issued the following statement (translated from Greek via Capital.gr): "[...] The extremely interesting thing that emerged from the meeting is that technological progress has now significantly reduced the cost of energy storage. At the same time, successful competitions for new RES investments in Greece, led to an equally significant reduction in the cost of energy production. As a result, the conversion of the islands to RES, apart from being environmentally useful, is now also economically viable. In this context, cooperation with Tesla can prove to be extremely beneficial, as the American company officials have highlighted, showing strong interest in the initiatives promoted by the Ministry for 'smart' and 'energy' islands."

Tesla has reportedly already suggested a pilot project to demonstrate their microgrid system in the region. The government would like it to be on the island of Limnos. The idea is to install a large solar array and combine it with an energy storage facility to store the excess energy during the day and use it at night when the sun is not shining.

An anonymous reader quotes a report from The Verge: IMDb is known as the place to go to look up details for any film under the sun, and now it's entering the streaming video arena. The company has launched Freedive, a free streaming platform that's supported by periodic ad breaks. The service's films and TV shows are available to registered IMDb or Amazon users and Amazon Fire TV owners. (The list of compatible devices is the same as the list for Prime Video.) Fire owners can navigate the service by way of a new icon in the "Your Apps & Channels" section or by telling their Amazon smart device, "Alexa, go to Freedive." The site says it will continually add new offerings to the site. The site will also indicate on a film's page if it's available on Freedive.

An anonymous reader quotes a report from The Independent: China will introduce the world's first driverless trains to run at speeds of up to 217 mph (350 km/h) on the Beijing-Zhangjiakou railway line. The automatic operation bullet trains were trialled on a section of the Beijing-Shenyang line in 2018 by the China Railway Corporation (CRC) and the system passed all safety tests. "The bullet train can automatically depart, operate between stations and adjust the train's operation to meet its precise timetable after a single button is pressed," a researcher from China Academy of Railway Sciences told the Sciences and Technology Daily. A driver currently performs these operations on high-speed trains.

For the first 10 years of the high-speed ATO trains, an attendant will still be deployed on board to ensure nothing goes wrong. After that, the trains will be totally driverless. Experts say this should improve safety long-term. "An automatic driving system could greatly improve the safety of trains which run on high-speed railways, compared with human drivers who may have sudden health problems or disregard safety precautions during driving," Sun Zhang, a railway expert and professor at Shanghai Tongji University, told the Global Times. The Beijing-Zhangjiakou Line is currently being constructed for the 2022 Winter Olympic Games, "to enable easy travel between Beijing and the Winter Olympic Village in 50 minutes," the report says.

The "super blood wolf moon eclipse" is coming to a sky near you later this month. "The total lunar eclipse will start late on Sunday, Jan. 20 and finish early on Monday, Jan. 21," reports USA Today. Slashdot reader Zorro shares the report: Total lunar eclipse: A total lunar eclipse occurs when the moon and the sun are on exact opposite sides of Earth, according to NASA. When this happens, Earth blocks the sunlight that normally reaches the moon. Instead of that sunlight hitting the moon's surface, Earth's shadow falls on it. Starting at 9:36 p.m. EST Jan. 20, skywatchers will notice a "little notch is taken out of the moon," according to Brian Murphy, director of Indiana's Holcomb Observatory & Planetarium and Butler University professor. At 10:34 p.m., it moves into a partial eclipse, and starting at 11:41 p.m., the full eclipse begins; a maximum eclipse occurs at 12:12 a.m. Jan. 21. The total eclipse ends at 12:44 a.m.

Supermoon: A supermoon occurs when the full moon is at the closest point of its orbit to the Earth (perigee). That makes the moon look extra-close and extra bright -- up to 14% bigger and 30% brighter than a full moon at its farthest point from Earth, known as the apogee, NASA said. This is the first of three supermoons in 2019. The others will be on Feb. 19 and March 21. Of these, the Feb. 19 full moon will be the closest and largest full supermoon of 2019.

"Blood" moon: That is just the reddish color the moon will appear during the total lunar eclipse.

"Wolf" moon: According to the Old Farmer's Almanac, Native Americans called the January full moon the "wolf" moon because it appeared when wolves howled in hunger outside the villages.

An anonymous reader quotes a report from NPR: There's a big molecule, a protein, inside the leaves of most plants. It's called Rubisco, which is short for an actual chemical name that's very long and hard to remember. Rubisco has one job. It picks up carbon dioxide from the air, and it uses the carbon to make sugar molecules. It gets the energy to do this from the sun. This is photosynthesis, the process by which plants use sunlight to make food, a foundation of life on Earth. "But it has what we like to call one fatal flaw," Amanda Cavanagh, a biologist and post-doctoral researcher at the University of Illinois, says. Unfortunately, Rubisco isn't picky enough about what it grabs from the air. It also picks up oxygen. "When it does that, it makes a toxic compound, so the plant has to detoxify it."

Plants have a whole complicated chemical assembly line to carry out this detoxification, and the process uses up a lot of energy. This means the plant has less energy for making leaves, or food for us. Cavanagh and her colleagues in a research program called Realizing Increased Photosynthetic Efficiency (RIPE), which is based at the University of Illinois, have spent the last five years trying to fix Rubisco's problem. "We're sort of hacking photosynthesis," she says. They experimented with tobacco plants, just because tobacco is easy to work with. They inserted some new genes into these plants, which shut down the existing detoxification assembly line and set up a new one that's way more efficient. And they created super tobacco plants. "They grew faster, and they grew up to 40 percent bigger" than normal tobacco plants, Cavanagh says. These measurements were done both in greenhouses and open-air field plots. The scientists are trying to apply this technique to other plants, like tomatoes, soybeans, and black-eyed peas, which are a staple food crop for a lot of farmers in sub-Saharan Africa. Cavanagh and her colleagues published their work this week in the journal Science.

According to new research from Rice University, Texas has enough natural patterns of wind and sun to operate without coal. "Scientists found that between wind energy from West Texas and the Gulf Coast, and solar energy across the state, Texas could meet a significant portion of its electricity demand from renewable power without extensive battery storage," reports Houston Chronicle. "The reason: These sources generate power at different times of day, meaning that coordinating them could replace production from coal-fired plants." From the report: Texas is the largest producer of wind energy in the United States, generating about 18 percent of its electricity from wind. Most of the state's wind turbines are located in West Texas, where the wind blows the strongest at night and in the early spring, when demand is low. The resource, however, can be complemented by turbines on the Gulf Coast, where wind produces the most electricity on late afternoons in the summer, when power demand is the highest. Solar energy, a small, but rapidly growing segment of the state's energy mix, also has the advantage of generating power when it is needed most -- hot, sunny summer afternoons.

In the summer, Gulf Coast wind generation could overtake West Texas wind capacity from about 1 p.m. to 8 p.m. when sea breezes kick in, Rice research showed. From about 8 a.m. until 6 p.m., solar power average capacity also could exceed wind generation in West Texas, which increases as evening turns to night. In the winter, winds in West Texas strengthen and generation increases, dropping off about 9 a.m., when solar energy begins to ramp up. "It's all a matter of timing," said Dan Woodfin, senior director of system operations at the state's grid manager, the Electric Reliability Council of Texas. Weather, however, remains unpredictable. Texas would still need battery storage and natural gas-fired power plants to fill in gaps when, for example, winds might slacken earlier than expected.

Longtime BitTorrent executive and recent CEO Rogelio Choy left the company just 6 months after its acquisition by blockchain entrepreneur Justin Sun. Coincidentally, Choy's departure comes just as BitTorrent is doubling down on blockchain tech: The company announced Thursday that it is adding a crypto-currency to its popular uTorrent client.

From a report: Choy had been BitTorrent's chief operating officer from 2012 to 2015. After a 2-year stint at an on on-demand startup, he rejoined the company in 2017 as its CEO. His departure was confirmed by a company spokesperson Thursday, who said that he "decided to pursue other opportunities." One possible point of contention is BitTorrent's increased focus on crypto-currencies: The company announced Thursday that it was adding a crypto token to its popular uTorrent Windows client. The token will initially allow uTorrent users to achieve faster download speeds. The exact reasons for his departure are unknown at this time, but a source close to the company suggested that there had been disagreements about the direction of the company.

NASA's New Horizons spacecraft will visit a tiny and mysterious object in the Kuiper belt on Tuesday, seeking clues to the formation of our cosmic neighborhood. From a report: In June 1983, newspaper headlines declared that NASA's Pioneer 10 spacecraft had left the solar system, crossing beyond the orbit of Neptune. It was the common view of the time: All of the solar system's big, interesting things -- the sun and the nine planets -- were behind Pioneer 10. Thirty-five years later, the Kuiper belt -- the region Pioneer 10 was just entering -- and the spaces beyond are perhaps the most fascinating parts of the solar system. In their vast, icy reaches are clues about how the sun and planets, including ours, coalesced out of gas and dust 4.5 billion years ago. Even farther out might be bodies the size of Mars or Earth, or even a larger one some astronomers call Planet Nine, and technological advances could usher in a new age of planetary discovery.

On Tuesday, New Horizons, the NASA spacecraft that snapped spectacular photographs of Pluto in 2015, will provide humanity with a close-up of one of these mysterious, distant and tiny icy worlds. Its target of exploration is believed to be just 12 to 22 miles wide, known as 2014 MU69 -- its designation in the International Astronomical Union's catalog of worlds -- or Ultima Thule, the nickname bestowed upon it by the New Horizons team. This will be the farthest object ever visited by a spacecraft. New Horizons will speed past Ultima Thule at 31,500 miles per hour and pass within 2,200 miles of the surface. What the probe finds could reveal much about the earliest days of the solar system and what else lies in the Kuiper belt.

A computer virus hit newspaper printing plants in Los Angeles and at Tribune Publishing newspapers across the country. From a report: Tribune Publishing said Saturday night that malware affected its ability to print newspapers across its chain of outlets, including the Chicago Tribune, the New York Daily News, the Baltimore Sun and the Orlando Sentinel. Many subscribers to the Los Angeles Times and San Diego Union-Tribune, which were previously owned by Tribune Publishing and still share some production technology with the company, stepped into a chilly sunny morning Saturday only to find empty doorsteps. The computer malware was detected Friday and "impacted some back-office systems which are primarily used to publish and produce newspapers across our properties," said Marisa Kollias, Tribune communications vice president, in a statement.

NASA's New Horizons spacecraft passed Pluto in 2015. But now it's getting strange readings while approaching its next destination, the Ultima Thule asteroid.

Popular Mechanics reports: Ultima Thule appears to not have a light curve, which is perplexing scientists... Asteroids like Ultima Thule reflect sunlight -- that's why they're bright spots instead of dark spots -- but the amount of light they reflect depends on how much of their surface is facing the Sun. The bigger their surface area, the brighter they become. Small asteroids like Ultima Thule aren't perfectly round, which means how much of their surface is facing the Sun changes as they rotate....

Ultima Thule isn't changing its brightness at all. New Horizons has been watching Ultima Thule for three months and hasn't spotted any brightness change, which is really odd. Ultima Thule is definitely not spherical -- astronomers determined that a year ago -- so why doesn't its brightness change?
One theory is that the New Horizon's probe is perfectly aligned with the asteroid's axis of rotation, so it's only seeing Ultima Thule's north (or south) pole. Another is that the asteroid is surrounded by dust clouds that "even out" its light curve. But that usually only happens when asteroids are near the sun and heating up, whereas Ultima Thule "is cold and dark and shouldn't have any dust...."

"Fortunately, we might not have to wait long for an answer to this problem. New Horizons will fly by Ultima Thule on January 1, and should give us high-resolution photos of the entire system," the article concludes. "With any luck, those photos will solve the mystery."

Rick Zeman writes: Astronomers in Hawaii have discovered the furthest object in our solar system, a dwarf planet aptly named "Farout." This planet is 100 times farther than Earth is from the sun (120 AU from the sun) and is thought to be composed of ice. The object is so far away that researchers estimate it probably takes more than 1,000 years to make one trip around the sun. For reference, Pluto is 34 AU away and takes about 248 years to orbit the sun. Eris, the next most distance object know, is 96 AU from the sun.

On Sunday night, a comet that orbits between Jupiter and the sun will make its closest approach to Earth in centuries. According to Tony Farnham, a research scientist in the astronomy department at the University of Maryland, the comet will appear as a bright, fuzzy ball with a greenish-gray tint. "You've got a one-kilometer solid nuclear in the middle, and gas is going out hundreds of thousands of miles," says Tony. The comet glows green because the gases emit light in green wavelengths. The New York Times reports: The ball of gas and dust, sometimes referred to as the "Christmas comet," was named 46P/Wirtanen, after the astronomer Carl Wirtanen, who discovered it in 1948. It orbits the sun once every 5.4 years, passing by Earth approximately every 11 years, but its distance varies and it is rarely this close. As the comet passes by, it will be 30 times farther from Earth than the moon, NASA said. The proximity of 46P/Wirtanen provides an opportunity to research the tail of the comet and see farther into the nucleus.

The comet is visible now but it will shine even brighter on Sunday as it reaches its closest approach, 7.1 million miles from Earth. That may sound really far, but it is among the 10 closest approaches by a comet in 70 years, NASA said. Only a few of those could be seen with the naked eye. Don't worry if you miss the comet on Sunday. It should be just as visible for a week or two because its appearance will change gradually. After it moves on, it won't be this close to Earth again for hundreds, if not thousands, of years. Online charts can help pinpoint its location.

Researchers at the University of Geneva Switzerland have used NASA's Hubble telescope to find an exoplanet that's evaporating. The exoplanet, GJ 3470b, shows signs of losing hydrogen in its atmosphere, causing it to shrink. USA Today reports: The study is part of exploration into "hot Neptunes," planets that are the size of Neptune, sit very close to their star, and have atmospheres as hot at 1,700 degrees Fahrenheit, says NASA. Finding a "hot Neptune" is rare because they sit so close to their star and tend to evaporate more quickly. In the case of GJ 3470b, scientists classify it as a "warmer" Neptune because it sits farther away from its star. The exoplanet discovered by astronauts is losing its atmosphere at a rate 100 times faster than a previous "warmer" Neptune planet discovered a few years before, according to a study published Thursday in the journal "Astronomy & Astrophysics." The planet sits 3.7 million miles from its star. For comparison, Earth is 92.9 million miles from the sun. Researchers say these "hot Neptune" planets shrink in size and morph into "Super Earths," versions of our planet that are massive and more rocky.

An anonymous reader quotes a report from Scientific American: A panel of 19 scientists drawn from the National Academies of Sciences, Engineering and Medicine recommended yesterday that the Department of Energy should continue an international experiment on nuclear fusion energy and then develop its own plan for a "compact power plant." A panel of 19 scientists drawn from the National Academies of Sciences, Engineering and Medicine recommended yesterday that the Department of Energy should continue an international experiment on nuclear fusion energy and then develop its own plan for a "compact power plant."

But as the National Academies' report noted, major challenges must be overcome to reach these goals, beginning with how to contain and control a burning "plasma" of extremely hot gas, ranging from 100 million to 200 million degrees Celsius, that can produce more heat than it consumes. The report calls the resulting plasma "a miniature sun confined inside a vessel." The world's biggest experiment intended to create and draw energy from burning plasma is under construction at Cadarache, France. It's called the International Thermonuclear Experimental Reactor (ITER) project, and its centerpiece is a large, doughnut-shaped, Russian-inspired reactor called a tokamak. Several member nations have already developed their own national programs, and the assembled National Academies experts concluded that the United States should eventually follow, once the ITER experiment shows there are ways to contain and manipulate a sustained fusion reaction. "It is the next critical step in the development of fusion energy," says the report.

schwit1 shares a report from The Times: It will shake houses and tall buildings, and unleash a 100ft tsunami on one of the most densely populated and industrialized coastlines in the world. It could kill and injure close to a million people. It will almost certainly come in the next few decades. Now, the Japanese government is making plans to evacuate millions of people in anticipation of what could be one of the worst natural disasters in history (Warning: source may be paywalled; alternative source). It is known as the Nankai Trough megaquake. The Japanese government has previously estimated that there is a 70 to 80 percent chance that such an event will take place in the next 30 years and that the earthquake, and subsequent tsunami, could kill 323,000 people and injure 623,000. Unfortunately, the report doesn't outline how the government plans to get people out of harm's way. The city with the most people in the danger zone is Nagoya, Japan's fourth largest city and home to 2.3 million people. "The home of the nation's industry Hamamatsu is also at risk and home to over 800,000 people," reports The Irish Sun.

The Voyager 2 probe, which left Earth in 1977, has become the second human-made object to leave our Solar System. From a report: It was launched 16 days before its twin craft, Voyager 1, but that probe's faster trajectory meant that it was in "the space between the stars" six years before Voyager 2. The news was revealed at the American Geophysical Union (AGU) meeting in Washington. And chief scientist on the mission, Prof Edward Stone, confirmed it.

He said both probes had now "made it into interstellar space" and that Voyager 2's date of departure from the Solar System was 5 November 2018. On that date, the steady stream of particles emitted from the Sun that were being detected by the probe suddenly dipped. This indicated that it had crossed the "heliopause" -- the term for the outer edge of the Sun's protective bubble of particles and magnetic field. And while its twin craft beat it to this boundary, the US space agency says that Voyager 2 has a working instrument aboard that will provide "first-of-its-kind observations of the nature of this gateway into interstellar space".