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SpaceX launched 60 more mini internet satellites late Monday, this time testing a dark coating to appease stargazers.It’s a “first step” compromise between SpaceX and astronomers fearful of having dark skies spoiled by hundreds and, eventually, thousands of bright satellites circling overhead.The Falcon 9 rocket blasted into a cold, clear night sky, recycled by SpaceX for its fourth flight. As the first-stage booster flew to a vertical landing on an ocean platform, the Starlink satellites continued hurtling toward orbit to join 120 similar spacecraft launched last year. Flight controllers applauded, and the launch commentator described the booster’s fourth touchdown as “awesome.” An hour later, all 60 satellites were free of their upper stage and making their own way in orbit. “It’s a beautiful sight,” the commentator observed.His Starlink fleet now numbering 180, SpaceX founder and chief executive Elon Musk plans to ultimately launch thousands of these compact flat-panel satellites to provide global internet service. Each spacecraft is just 575 pounds (260 kilograms).After the first Starlink batch of 60 was launched in May and the second in November, astronomers complained how the bright satellite chain was hampering their observations. In response, SpaceX came up with a darkening treatment to lessen reflectivity. The coating is being tested on one of the newly launched satellites.Jeff Hall, director of the Lowell Observatory in Flagstaff, Arizona, said the Starlinks have been just an occasional problem — so far — but noted the risk to stargazing will grow as the constellation expands and other companies launch their own fleets. He heads the American Astronomical Society’s committee on light pollution, space debris, and radio interference, and is working with SpaceX on the issue. The matter is on the agenda, in fact, at the society’s conference in Hawaii this week.“Anything that darkens the satellites is a step in the right direction,” Hall said in an email Monday. He said it’s too soon to know whether the dark coating will work, “but it definitely is just a first step and not enough to mitigate the issues astronomy will experience with the Starlinks.”The Starlinks are initially placed in a relatively low orbit of 180 miles (290 kilometeters), easily visible as a long, strung-out cluster parading through the night sky. Over a few months, krypton-powered thrusters raise the satellites to a 340-mile (550-kilometer) orbit. The higher the orbit, the less visible the satellites are from the ground, according to SpaceX. Even so, SpaceX said it’s supplying astronomy groups with the satellite coordinates in advance, so they can avoid the bright flyover times.Already established in launching satellites for others and making space station deliveries for NASA, SpaceX is among several companies looking to provide high-speed, reliable internet service around the world, especially in places where it’s hard to get or too expensive. Others include Jeff Bezos’ Amazon and OneWeb. SpaceX may start service later this year in the northern U.S. and Canada, then expand to the world’s most populated areas after 24 launches. 3170

Sen. Cory Booker, D-New Jersey, has endorsed former Vice President Joe Biden in the race for the Democratic presidential nomination.Booker made his announcement in a tweet early Monday morning."The answer to hatred & division is to reignite our spirit of common purpose. @JoeBiden won't only win - he'll show there's more that unites us than divides us. He'll restore honor to the Oval Office and tackle our most pressing challenges. That's why I'm proud to endorse Joe," Booker tweeted.Booker's endorsement is the latest boost in momentum for Biden's campaign, which has taken off since the former vice president's win in the South Carolina primary. Since that win, Biden racked up big wins in Super Tuesday primaries and picked up major endorsements from moderate candidates like Booker, Mike Bloomberg, Amy Klobuchar and Pete Buttigieg.Biden currently holds a slight delegate lead over Sen. Bernie Sanders (I-Vermont), with 664 delegates to Sanders' 573.Booker previously sought the Democratic presidential nomination and appeared in a number of debates, but dropped out prior to the Iowa caucuses. 1117

Science centers, Smithsonian centers, and art museums are shutting down amid the spread of coronavirus. On Thursday evening, the Smithsonian museums, galleries and National Zoo will all close on Saturday indefinitely. The news comes as a hit to the D.C., which was also slated to host the Cherry Blossom Festival later in the month. The Smithsonian issued the following statement:"The health and safety of Smithsonian visitors, staff and volunteers is a top priority. We are closely monitoring the coronavirus situation and maintain ongoing communication with local health officials and the Centers for Disease Controland Prevention. Due to the rapidly changing nature of the situation, we are not announcing a reopening date at this time and will provide updates on a week-to-week basis on our websites. Follow the Smithsonian on Instagram, Facebook and Twitter for immediate updates @smithsonian."The situation is similar in New York, where the Metropolitan Museum of Art is shutting down indefinitely. Here is what The Met had to say:"We will be closing all three locations—The Met Fifth Avenue, The Met Breuer, and The Met Cloisters—temporarily starting tomorrow, March 13, to support New York City’s effort to contain the spread of COVID-19. The Museum will undertake a thorough cleaning and plans to announce next steps early next week. While we don’t have any confirmed cases connected to the Museum, we believe that we must do all that we can to ensure a safe and healthy environment for our community which at this time calls for us to minimize gatherings while maintaining the cleanest environment possible. We look forward to soon announcing when we’ll be able to welcome our staff and visitors back to the Museum.” 1738

Service with a smile? That may be something employers should reconsider, according to a new study. Employees who fake smiles or suppress emotions for customers may be at risk for heavier drinking after work, according to a new 239

Special counsel Robert Mueller's team has expressed reluctance to him testifying publicly in front of the House Judiciary Committee, according to sources familiar with the matter.The special counsel's team has expressed the notion that Mueller does not want to appear political after staying behind the scenes for two years and not speaking as he conducted his investigation into President Donald Trump. One option is to have him testify behind closed doors, but sources caution numerous options are being considered in the negotiations between the committee and the special counsel's team.Justice officials are generally supportive of how the special counsel's team is proceeding with negotiations. As Attorney General Bill Barr told The Wall Street Journal last week: "It's Bob's call whether he wants to testify."Special counsel spokesman Peter Carr and the Justice Department declined to comment on the current status of negotiations.House Judiciary Chairman Jerry Nadler, a New York Democrat, has repeatedly said that Mueller must appear publicly, and he will subpoena Mueller if necessary."Eventually we will hear from Mueller because ... we will subpoena him if we have to," Nadler told CNN earlier this month. "I certainly hope it doesn't come to the, to our necessity to subpoena him," he added.Rep. Doug Collins, the top Republican on the Judiciary Committee, suggested at Tuesday's hearing, a meeting where former White House counsel Don McGahn did not appear after being subpoenaed, that Democrats appeared to have a lack of urgency scheduling Mueller's testimony."We've subpoenaed the documents, we've subpoenaed the underlying documents, we've subpoenaed stuff that we can't get, but the one thing that we seem to avoid is Mr. Mueller himself, the one who wrote it," Collins said. "We've asked since April about Mr. Mueller coming. But every time we seem to get close to Mueller, Mueller just gets pushed on a little bit. Haven't seen a subpoena here, and this is what's really amazing -- we'll get back to subpoenas in a moment -- but just think about that. You wanted the work of the author, but you don't want to talk to the author."After the hearing, Collins would not say whether he'd support a subpoena for Mueller's testimony.Separately, Nadler told CNN's Chris Cuomo on Monday he doesn't know what's keeping Mueller as an employee of the Justice Department, suggesting he was "more subject to their discipline" than he would be as a private citizen. "The report is finished. I don't know why he is still there," Nadler said.Mueller has been seen arriving for work almost every morning since the report was released in April.The Justice Department has not commented on what work still remains. 2726