How did so much life appear on our planet when others seem devoid of any species at all?
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Answers
Answer. Answer: 1High concentration of electronegative/electropositive elements available in the atmosphere/environment (to allow basic chemical reactions that life may need: on earth, life adapted for oxygen);
What made life appear on Earth where as in all probability, it did not appear on any other planet in our solar system?
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Scientist don’t know yet what creates life. But, since life evolves on earth, after it appeared here, it was only a matter of time before it spread to the whole world. Why? Because for our life, the earth is about an endless source of food and resources. Even if conditions change (atmosphere composition, sea compo sition, temperature), life will evolve and find a way to adapt (as it has done countless times already). This is a tr ait life on earth has.
Stephen Hawking thought a lot about this, and for a given period in his life, he even thought god was involved in giving earth specific protections and peculiar conditions, to give life enough time to evolve and take the whole world. In other words, any planet could have life, but life would thrive easier on planets that give it a “slac k” (calm planets). If conditions are too harsh, life could “appear”, but it would simply die before it could spread. You should look for these things in a planet in order to log it as candidate to contain life:
1High concentration of electronegative/electropositive elements available in the atmosphere/environment (to allow basic chemical reactions that life may need: on earth, life adapted for oxygen);
2Low and stable income of radiation (because ra diation disrupts complex molecules much faster than life could or would bear);
3Enough distance from the sun so as to not be highly influenced by solar flares (also because of radiation). Though red dwar ves last for much longer than K-type stars such as our sun, it’s debatable if earth-like lifeforms would be able to live in a red dwarf system, because the habitable zone around that kind of star is simply too close and the planet would suffer a lot in the early ages with solar flares, let alone keep an atmosphere;
4Some kind of protection against “fast-events” (fast-events being defined as those that change conditions faster than life can adapt to them: meteor strikes, planetary col lisions, gamma ray bursts, solar flares, etc.);
If I had to bet, I’d say none of these conditions are mandatory for life to appear and thrive, at least not if you consider the possibility of other types of life (gamma ray autotrophes, silicon-based lif eforms, etc.). However, it SEEMS they are needed, or a given planet will just be ster yle. Anyway we still know very little about life on other planets since we have right now just the earth and mars as planets in the habitable zone for us to study, which signifies a very low samp ling to even make the most basic conclusions without a high chance of error.
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