Why is the presence of water and oxygen taken into account when searching for life on other planets? Can't aliens drink and breathe in peacefully what is deadly to us?

Why is the presence of water and oxygen taken into account when searching for life on other planets? Can't aliens drink and breathe in peacefully what is deadly to us?

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answers (2)

Answer 1
January, 2021

In principle, they can, but we are primarily interested in life like ours. In addition, no other is yet known to us: if it is open, then such options will be taken into account.

Well, there is reason to suspect that life on dense rocky terrestrial planets will most likely become highly developed - and not, for example, on giant planets or oceans that do not have a solid surface (from hydrogen and helium or it is difficult to build an industrial civilization out of water). And on the terrestrial planets, water-oxygen life seems to have no alternative.

There are theoretical calculations regarding methane-hydrogen life in cryogenic conditions of planets like Titan (which have a solid surface), but there are doubts that it is capable of rapid evolution (the reaction of hydrogenation of carbon gives 5 times less energy than the reaction of its oxidation, all biological processes will go rather slowly). In any case, for bold conclusions that something like this is possible, first you should study Titan: if such a life can exist, then almost certainly it should have developed there.

Answer 2
January, 2021

Not really.

There is a theory that there might be a flint life form. Unlike us, the main building block in the body is silicon (Si) rather than carbon (C). Roughly speaking, one can draw an analogy with golems from milfoggy or fantasy.

Why are they looking for people like us? Well, imagine, we have found "living" stones that are multiplied by mudding (such, in principle, can be considered living beings), how we will establish contact with them, if we are reasonable, and who will look for living amni ... Or else, Let's say some energetic form of life, without physical matter (spirits, ghosts), it will also be very difficult to get along with them.

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