How did so much life appear on our planet when others seem devoid of any species at all?
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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);
2Low and stable income of radiation (because radiation 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 dwarves 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 collisions, gamma ray bursts, solar flares, etc.)
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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.
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 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:
1 High concentration of electronegative/electropositive elements available in the atmosphere/environment
2 Low and stable income of radiation
3 Enough distance from the sun so as to not be highly influenced by solar flares
4 Some kind of protection against fast event
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 sampling to even make the most basic conclusions without a high chance of error.