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| The Snows of Mars | |
| 摘 要： | Marsh old sasp ecial placein the human imagination as the planetm ostlike the Earth .It has an atmosphere,seasons,and dstinctive polar ice caps.The ice caps,first observed by Giovanni Cassini in 1666,immediately raised tantalizing questions.Are they made of water ice like the giant glaciers that smother Antar ctica?Are they the frozen remains of long -vanished oceans?If they melt-ed ,could Mars become ahabitable place?NASA's Mars Global Surveyor,currenfiy in orbit about the Red Plan… |
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