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Since it landed on Mars in 2012 NASA's Curiosity rover has been exploring Gale Crater, a vast, dry ancient lake bed with a mountain at its center. Now, Curiosity has found sediments containing sulfate salt in the crater, which suggest it once held salty lakes.A range of salts have been found on Mars in different locations. Researchers interpret these as evidence of ancient brines. Salty water formations seemed to increase on the Martian surface as the planet transitioned to an arid climate 3.5 billion years ago.The new detection of sulfate salts came from sedimentary rocks dated to between 3.3 and 3.7 billion years ago. Curiosity has analyzed other, older rocks on Mars and didn't detect these salts in them.Researchers believe the salt is evidence of the crater's lake evaporating in the Red Planet's arid environment. They also believe studying younger rocks in the future could shed more light on how the Martian surface dried out.Gale Crater was created by an ancient impact, then filled in with sediment layers over time. Mount Sharp, the mountain at its center, was created by wind erosion of the hardened sediment layers. Those same layers act like chapters in the history of Mars and provide clues to its environment at each point in time.At the time the sulfate salts were present, lakes were probably scattered across the crater floor, fed by streams in the crater walls. Over time, the streams would overflow and then evaporate, trapped in a repetitive cycle taking place over millions of years.The findings were published Monday in the journal 1576

Subtropical Storm Andrea formed in the Atlantic basin Monday afternoon, marking the first named tropical system of the 2019 hurricane season, the National Hurricane Center announced. As of 6:30 p.m. ET, Andrea had top winds of 40 MPH and was located 335 miles southwest of Bermuda. The National Hurricane Center said that an Air Force Reserve Hurricane Hunter plane confirmed winds near 40 MPH. The forecast calls for Andrea to possibly strengthen overnight before weakening as it drifts toward Bermuda. It is not currently a threat to the United States coast. 573

Robert F. Kennedy's granddaughter, 22-year-old Saoirse Kennedy Hill, died on Thursday at the Kennedy's Hyannis Port, Mass. compound of a suspected drug overdose, the New York Times 193

RICHMOND, Va. – Thousands of gun-rights activists and other groups crowded the streets around Virginia’s Capitol to protest plans by the state's Democratic leadership to pass gun-control legislation. Citing credible threats of violence, Gov. Ralph Northam declared a temporary state of emergency days ahead of Monday’s rally, banning all weapons including guns from Capitol Square, where the event was set to be held. Virginia's highest court has upheld the ban. The Supreme Court issued its decision late Friday, rejecting an appeal from gun-rights groups that said the ban violated their Second Amendment right to bear arms.The court did not rule on the merits of the case, however. The justices said they did not have enough information to decide whether a lower court judge had ruled appropriately. The Southern Poverty Law Center says that threats of violence have been “rampant” online among anti-government and far-right groups.Militia groups and white supremacists were expected to mix with gun-rights activists, raising fears that the state could again see the type violence that exploded in Charlottesville in 2017.The protest came to a close Monday afternoon with no known incidents.WATCH VIDEO OF THE EVENT BELOW: 1237

Short-video social media app TikTok is known for videos of dancing, singing and jokes. The app’s popularity has skyrocketed this year, especially with kids and teens."It’s mostly younger kids,” Kendall Wheeler explained. Wheeler, who has been dancing since she was 3 years old, has more than 440,000 followers on the app. The 17-year-old dancer downloaded the app when she was 15 as a way to share dance — and other — videos. Now, her content has expanded to acting, trends and other topics, and her image is attracting companies looking to sponsor or advertise their products with her.“A lot more companies have been reaching out to me,” she said. “I’ve made a pretty good amount of money from just going live.”Going live on the app and interacting with followers is the easiest way to make money on TikTok, and it allows for direct audience engagement. “My friends are pretty much from TikTok and I FaceTime them all the time,” she explained. “My social circle is on TikTok.”A 991

来源：资阳报