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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit06
For Mars to have rivers, it must once have had streams, rain, clouds and an atmosphere, a planet just like the Earth today-if these were rivers. They had to be sure. The answers would come in 1998 wi2008-09-13 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit05
William Boynton is professor of planetary sciences at the University of Arizona. And he's dedicated his life to looking for water on Mars. The link between life and water is very strong. Even h..2008-09-11 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit04
These discoveries raised the stakes. Here was a planet similar to our own. Mars might not have cities or civilizations. But it could be home to other smaller life forms like microbes. Chris McKay is2008-09-11 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit03
Conditions on Mars were so harsh that it was hard to imagine any life surviving there. The idea of sophisticated aliens was wiped out. We know that conditions on Mars today are not very good for life2008-09-10 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit02
I think it is exciting. Because it would imply that if life arose independently on Mars. The implication is that life is pervasive throughout the universe. This is why Mars has so obsessed scientists2008-09-09 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit01
In 2001 a new NASA probe was launched. Called Odyssey, it was sent to Mars to carry out the most detailed analysis ever of the planet’s surface. What it has discovered may be about to answer one of2008-09-09 编辑:echo
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[自然百科] 探索世界奥秘之Wild Europe-Genesis (欧洲自然写真)
Wild Europe - Genesis 肇始之初- 14Despite this enormous flood, the Mediterranean took more than a century to refill. But what is more amazing is that this process of drying and flooding has happened2008-09-08 编辑:echo
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[自然百科] 探索世界奥秘之Wild Europe-Genesis (欧洲自然写真)
Wild Europe - Genesis 肇始之初- 13As the sun beat down, something like 4,000 cubic kilometers of water evaporated from the Mediterranean surface every year. And with no Atlantic water to replenish it2008-09-08 编辑:echo
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[自然百科] 探索世界奥秘之Wild Europe-Genesis (欧洲自然写真)
Wild Europe - Genesis 肇始之初- 12...Africa. The African plate has been drifting north over millions of years. And when it pushes against the European plate, huge folds of rock have been forced up an2008-09-07 编辑:echo
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[自然百科] 探索世界奥秘之Wild Europe-Genesis (欧洲自然写真)
Wild Europe - Genesis 肇始之初- 11...and marked the growing pains of a young ocean. 16 million years ago, North America and Greenland finally split apart from Europe. As the continental plates separa2008-09-07 编辑:echo