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哪些天体上可能有生命存在呢？这个天体又必须具备什么样的条件呢？人们了解了生命起源的过程之后,认为至少应有这样几个条件：一是适合生物生存的温度,一般应在-50~150℃之间；二是必要的水分,生命物质诸如蛋白质、核酸的活力都和水紧密相关,没有水,也就没有生命；三是适当成分的大气,虽然已发现少数厌氧菌能在没有氧气的条件下生存,但氧气和二氧化碳对于生命的存在是极为重要的；四是要有足够的光和热,为生命系统提供能源。
——张申碚、赵晓梅《宇宙生命之谜》
阅读上面的材料,想一想,一个天体如果存在生命,那么必须具备的条件有：
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——张申碚、赵晓梅《宇宙生命之谜》
阅读上面的材料,想一想,一个天体如果存在生命,那么必须具备的条件有：
一是适合生物生存的温度，一般应在-50~150℃之间；二是必要的水分；三是适当成分的大气；四是要有足够的光和热。
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地球
星球。我觉得这个星球有
(有/没有)生命的存在,我的理由是：地球具备适合生物生存的温度、必要的水分、适当成分的大气以及足够的光和热。
答案
一是适合生物生存的温度，一般应在-50~150℃之间；二是必要的水分；三是适当成分的大气；四是要有足够的光和热。
地球；有；地球具备适合生物生存的温度、必要的水分、适当成分的大气以及足够的光和热。
地球；有；地球具备适合生物生存的温度、必要的水分、适当成分的大气以及足够的光和热。
我们生活的地球只是浩瀚宇宙中的渺小一粟。未知光年外的星球中是否有生命体存在呢？
请你用英文给小伙伴写一封信,写一写你的想法吧！
______
请你用英文给小伙伴写一封信,写一写你的想法吧！
Dear Friend,
I think there might be life on other planets in the universe. The universe is so big with many stars and planets. Some planets could have the right conditions like Earth, such as water and air. Maybe there are living things there, but we haven't found them yet. We need to study more to know.
Yours,
Lily
I think there might be life on other planets in the universe. The universe is so big with many stars and planets. Some planets could have the right conditions like Earth, such as water and air. Maybe there are living things there, but we haven't found them yet. We need to study more to know.
Yours,
Lily
______
答案
Dear Friend,
I think there might be life on other planets in the universe. The universe is so big with many stars and planets. Some planets could have the right conditions like Earth, such as water and air. Maybe there are living things there, but we haven't found them yet. We need to study more to know.
Yours,
Lily
I think there might be life on other planets in the universe. The universe is so big with many stars and planets. Some planets could have the right conditions like Earth, such as water and air. Maybe there are living things there, but we haven't found them yet. We need to study more to know.
Yours,
Lily
