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发布时间: 2025-05-25 09:18:22北京青年报社官方账号
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Ray graduated from college with an associate degree in the arts. He plans to head to Cleveland State University in the spring to study film directing, school officials said. 185

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Shooting outside nightclub wounds 15 people, 3 are in critical condition at area hospitals. One woman was killed at the scene. An armed security guard shot and killed the alleged gunman. Live reports later this morning on @41actionnews Update from @kcpolice: pic.twitter.com/MVqrM5kMco— Andres Gutierrez (@AFGutierrez) January 20, 2020 347

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TAMPA, Fla. -- A Florida woman finds a way to include her husband in their Christmas photo during his deployment. Danielle Cobo will spend Christmas away from her husband. He deployed in early 2019. 211

  

ROME, Italy – Italy has ordered schools and universities to close nationwide through March 15 in a bid to contain the novel coronavirus, saying the prudent suspension was taken after a careful analysis of how the epidemic was spreading.More than 2,500 cases of the virus have been confirmed in the European country and 79 deaths have been reported, according to a 376

  

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

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