Question

火星是否适合人类居住?

Answer 1

不适合 事实上，对于移居其他月球或火星的可行性，霍金的回答也显得相当无奈。他这样说：「……但月球和火星都很细小，而且缺乏或完全没有大气层，除非离开太阳系，否则找不到像地球一样美好的地方。」人类生于地球，我们的身体只为适应地球生态而生，离开了天然的生境地，去到任何一个星球，当然都不及地球美好。 火星的体积不到地球的六分之一，火星大气比地球大气稀薄得多，主要成分是二氧化碳，占95％，其余3%是氮，氧气和水蒸气含量极微，它的平均温度只有－30℃左右，约等于地球南极冬季的平均温度，至于火星究竟有没有水？有，不过全都结成了冰。火星这样「温和」气候，是否吸引到你？ 就算他日发现到有一个和地球一模一样的星球，能够适合人类居住，但我们仍然要无止境不顾一切地追求经济增长和物质生活，继续采矿、砍伐森林、燃烧化石燃料、制造各式各样的化学品，历史只会重演。地球是我们的家园，文明社会把这个家弄得污烟瘴气，然后弃之，再到别处占据别人的家园。这种想法充份反映文明社会的思维模式，以发展和进步之名，首先破毁本土的森林和天然环境，然后到别国开发当地的森林和土地。现在，地球很快再无地可开发、或再不适合生物或人类居住，就开始打其他的星球主意。我们又是否真的有权去侵占其他星球？
参考: life123/site/?p=379
The current understanding of plaary habitability—the ability of a world to develop and sustain life—favors plas that have liquid water on their surface. This most often requires that the orbit of a pla lie within the habitable zone
which for the Sun currently extends from just beyond Venus to about the semi-major axis of Mars. During perihelion Mars dips inside this region
but the pla's thin (low-pressure) atmosphere prevents liquid water from existing over large regions for extended periods. The past flow of liquid water
however
demonstrates the pla's potential for habitability. Recent evidence has suggested that any water on the Martian surface would have been too salty and acidic to support terran life. The lack of a magosphere and extremely thin atmosphere of Mars are a greater challenge: the pla has little heat trfer across its surface
poor insulation against bombardment and the solar wind
and insufficient atmospheric pressure to retain water in a liquid form (water instead sublimates to a gaseous state). Mars is also nearly
or perhaps totally
geologically dead; the end of volcanic activity has stopped the recycling of chemicals and minerals beeen the surface and interior of the pla. Evidence suggests that the pla was once significantly more habitable than it is today
but whether living ani *** s ever existed there is still unclear. The Viking probes of the mid-1970s carried experiments designed to detect microani *** s in Martian soil at their respective landing sites
and had some apparently positive results
including a temporary increase of CO2 production on exposure to water and nutrients. However this sign of life was later disputed by many scientists
resulting in a continuing debate
with NASA scientist Gilbert Levin asserting that Viking may have found life. 2009-09-13 22:33:25 补充： A re- *** ysis of the now 30-year-old Viking data
in light of modern knowledge of extremophile forms of life
has suggested that the Viking tests were also not sophisticated enough to detect these forms of life. 2009-09-13 22:33:51 补充： The tests may even have killed a (hypothetical) life form. Tests conducted by the Phoenix Mars Lander have shown that the soil has a very alkaline pH and it contains magnesium
sodium
potassium and chloride. 2009-09-13 22:34:19 补充： The soil nutrients may be able to support life
but life would still have to be shielded from the intense ultraviolet light. 2009-09-13 22:34:43 补充： At the Johnson space center lab anic pounds have been found in the meteorite ALH84001
which is supposed to have e from Mars. 2009-09-13 22:34:53 补充： They concluded that these were deposited by primitive life forms extant on Mars before the meteorite was blasted into space by a meteor strike and sent on a 15 million-year voyage to Earth. 2009-09-13 22:35:16 补充： Also
*** all quantities of methane and formaldehyde recently detected by Mars orbiters are both claimed to be hints for life
as these chemical pounds would quickly break down in the Martian atmosphere. 2009-09-13 22:35:21 补充： It is possible that these pounds may be replenished by volcanic or geological me such as serpentinization.
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不太适合 因为火星需然有大气层、水 但它的大气层大多是二氧化碳
也十分薄
它的温差也很大
一天可以尤50℃变成-400℃

参考: me
适合 因为有水 而水系由氧和氢组成 所以适合人类居住