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It is one thing to land science instruments on Mars; however, it is quite
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another to establish a base for humans to explore planet. Daytime temperatures
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can be rise above freezing, but, because of the extremely thin atmosphere,
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the sun heat radiates back into space. Even at the equator, the temperature
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drops¡ª50¡æat night. In fact, there is no ozone(³ôÑõ) layer to keep out
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ultraviolet(×ÏÍâÏßµÄ)radiation, and hardly some oxygen for either breathing
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and burning conventional fuels. But despite all these problems, scientists are
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currently working transport and clothing for Mars and an artificial environment
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in which colonists could live. However, the potential cost make the idea of
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human life on Mars nothing other than a fantastic dream.
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