三门峡治疗痤疮青春痘(三门峡市祛痘印医院) (今日更新中)

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

Several people are dead after a gunman opened fire near a downtown Dayton, Ohio entertainment district early Sunday morning.A few hours later, a crowd gathered around the scene of the mass shooting, looking at the bullet holes left behind.Anthony Hickson heard the gun shots and describes what happened next.“Everybody started bomb rushing and you knew something bad was going on,” he said. “People running over top of each other, because you could really only get out of one doorway.”Holding back his tears, Dayton local Christian Stargell said this shooting has shaken this community to its core.“The past couple of months have been real tough for Dayton, and I think we’ve seen how we can come together and handle it,” he said.Coming together in this time of need.“I’m doing this because I love Dayton and I want to do what's best for Dayton,” said Nicole Cornett of BIllie Gold Bubble Tea. On Sunday afternoon, Cornett parked her food truck a few blocks away from the shooting, saying she’s donating all the money she’s making to victims impacted by this shooting.“Dayton does nothing but lift you up and support you, and they do that to every business here in town,” she said. “It’s just really upsetting because people now are going to be afraid and they’re going to be afraid to come out.”This community, however, did not hide in fear. Rather, it filled the streets where this shooting happened.Hundreds of people came out Sunday night showing support during a candle light vigil saying Dayton can remember those who lost their lives and eventually survive this tragedy. 1589

Sen. Amy Klobuchar said Monday that her husband, John Bessler, has tested positive for COVID-19.Klobuchar said Bessler learned of the positive test Monday morning."While I cannot see him and he is of course cut off from all visitors, our daughter Abigail and I are constantly calling and texting and emailing. We love him very much and pray for his recovery," she wrote in a post on 395

Students whose families make less than ,000 a year will be able to attend the University of Texas flagship campus in Austin without having to worry about tuition.To make attending college more affordable for low-income students, the University of Texas System of Board of Regents voted unanimously Tuesday to create a 0 million endowment for financial assistance from the state's Permanent University Fund, according to a 441

RICHMOND, Va. (AP) — Confederate monuments have become a target of protesters demonstrating against the police killing of George Floyd. As tense protests swelled across the country Saturday into early Sunday, monuments in Virginia, the Carolinas and Mississippi were defaced. The headquarters of the United Daughters of the Confederacy in Richmond also burned for a time and had graffiti scrawled on its exterior. The presence of Confederate monuments across the South and elsewhere in the United States has been challenged for years. Some of the targeted monuments have been under consideration for removal. In Tennessee and Pennsylvania, statues of people criticized for racist views, but without Confederate ties were also targeted. 747

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