NASA, Roskomos, Europe and China, everywhere consider large-scale lunar expeditions to be an integral part of the development of astronautics in the coming decades. And already now they are asking questions: what to look for in the second place? The primary interest is naturally aroused by water, but further efforts of scientists can be directed to search for traces of ancient lunar life.
Today the Moon is definitely lifeless, but could life have existed on it earlier, even if not for long? The most optimistic hypothesis looks like this: 3.5 billion years ago, the outer surface of the Moon had already cooled down, but the liquid core was seething right under it. It created a weak magnetic field, which, together with gravity, helped to keep the gases flowing from the bowels. The moon had its own atmosphere, albeit thin, but very saturated, thanks to which it had a primitive protection from cosmic radiation.
There was definitely liquid water on the Moon at that time, but right next to it, on the Earth, the proto-seas were already swarming with microorganisms. And if it is proved that meteorites from Mars flew to Earth and could bring the bacteria there, then the exchange of similar "messengers" between our planet and its satellite is even easier to imagine. The first to colonize the moon were not people, but microbes - in that short geological period, when there were paradise for them living conditions.
If the hypothesis is correct, then under the layer of regolith it will be possible to find no less traces of ancient life than we find fossil remains of creatures on Earth. Or, conversely, their absence will show the inconsistency of the theory of the travel of life through space on meteorites. But scientists still hope for a positive result, because it will help to better understand how life works in the Universe.