标签：Mars 相关文章
The surface of Mars is etched with ancient river valleys and lake basins. Which makes researchers think that liquid water once flowed on the Red Planet. But how? Today, Mars is too cold for much, if any, liquid water to exist. And 3.8 billion years a
2017年Scientific American(一)月
Is There Life on Mars? For most of the 20th century, there has been life on Mars. Or, at least in the minds of the Earthlings, who inhabit its closest planetary neighbor. When at the end of the 19th century, the American astronomer Percival Lowell th
英语流行话题阅读：语境识词4500
By David McAlary Washington 10 March 2006 Mars Reconnaissance Orbiter Another U.S. spacecraft has begun orbiting Mars to study the red planet in unprecedented detail. The Mars Reconnaissance Orbiter w
2006年VOA标准英语（三月）
By David McAlary Washington 21 November 2006 The U.S. space agency NASA says its oldest satellite orbiting Mars has probably ended its career. NASA engineers lost contact with it about three weeks ago and are losing hope of ever hearing from it agai
2006年VOA标准英语（十一月)
By Jessica Berman Washington 29 May 2008 As the newly deployed Phoenix spacecraft begins its mission in search of life near Mars' northern pole, scientists say an analysis of Martian deposits suggest there was once water on the planet, but it was too
VOA标准英语2008年（五月）
Ten Years of Roving Around Mars 十年的火星游荡 WASHINGTON The U.S. space agency, NASA, is celebrating the 10th anniversary of its Mars Exploration Rover Mission (MER), which began with the arrival of its robotic vehicles Spirit and Opportunity
VOA标准英语2014年(一月)
DAVID GREENE, HOST: This seems big. Scientists say for the first time they have clear evidence that the chemical building blocks of life exist on Mars. So is this the moment we can say there is life on the red planet? Well, NPR's Joe Palca says not y
2018年NPR美国国家公共电台6月
By Paul Sisco Washington, DC 02 August 2006 watch Viking report An illustration of a Viking landing on the red planet Thirty years after the first successful landing of a robotic probe on Mars by NASA's Viking spacecraft, the search for life on the
2006年VOA标准英语（八月）