The bias against life on Venus is partly rooted in our own biology. Human experience instructs that liquid water, preferably lot of it. is essential for life. In search for extraterrestrial life, we obsess over small rivers in Mars surface apparently carved by ancient gushes of water. and delight in hints of permafrost just underneath its surface. for backyard astronomers, its clouds reflects 75% of visible light.) Attention and then funding follow the water: Three more landers will depart for Mars this spring. and serious plans for sample-return missions hover in the midterm future.
If you have limited resources, you base exploration on what you know. says Arizona State University planetary geologist Ronal Greeley. Its like losing your keys on the way home al night: The first place you look is under the streetlights not because theyre more likely to be there. but because if they are. you ll spot them. For astrobiologists. the streetlights are the spectral lines for water. and theyve spotted that potential on Mars, Jupiters moon Europa. even Neptunes moon Triton. Not on the baking rocky flats of Venus.
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如果我们的太阳系里真有地狱的话,那一定是金星。那里的空气充满着肮脏的带有腐蚀性的硫磺气味,硫磺从古老的火山上发出,并在上空形成了酸云。/虽然金星(离太阳第二近的行星)不如水星那么靠近太阳,但是温室效应的肆虐使它更热。它是九大行星中最热的一个,高速华氏900度的高温烘烤面包那样烘烤着从赤道到两极的岩石表面。而这里的大气压力是你现在坐着的地方的90倍。从地球的角度来看,这里确实是一个绝境。这里一定没有生命。
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