Planetologists believe that the traces left by ancient civilizations in the space of the Solar System should be sought exclusively on the Moon or on Mars, since on the Morning Star and other planets and moons, they were most likely destroyed by geological and cosmic processes.
Participants in the Breakthrough Listen project, represented by Jason Wright, said that if it was possible for technologically advanced aliens to exist, then one can also think about the existence of highly developed civilizations once in the Solar System. SETI and similar projects engaged in the search for extraterrestrial intelligence, aimed to discover them from far-away stars.
Mars, Venus and Earth 3,5 billion years ago could support life on an equal footing. Now they have completed their “life zones”, where liquid water is possible. But after a billion years, Venus became a hot and “acidic” hell, and Mars – an anhydrous frozen desert. Theoretically, and there could have arisen life, but to avoid the greenhouse periods and total glaciation was possible only to the Earth. If they existed when they existed, then it disappeared long before the appearance on the Earth of a multicellular life and a person in general. It is not excluded and an attempt to “migrate” extraterrestrials to our planet, which could not be achieved due to some kind of cataclysm.
Wright says that scientists never seriously treated this topic, so he decided to fix it, and began to calculate the probability of whether the traces of ancient civilizations could have survived to our time. If they do, then only in the form of organic. Just like on the Earth, the action of the forces of nature, the roots of plants and microbial life, quickly “sweep them out.” For example, on Earth, “renewal” of the natural crust continues for 300-500 million years, so it is unlikely to find traces of aliens here.
Mars and the Moon in this key are significantly different, their bowels have long been in a “frozen” state, which is why they are more suitable for such searches. Although, if you look at the other side, their life terms are just as endless. On Mars, the destruction of alien artifacts could be facilitated by wind and other erosive sources, and on the Moon this could be the “diligence” of micrometeorites and cosmic rays.
The least suitable for search works is Venus, all possible alien traces that once were left, even if they were, have long since been destroyed by volcanic “eruptions”, “acidic” atmosphere and constant renewal of its surface.
As a result, Wright concluded that the chance to find traces of the once existing ancient aliens is categorically and negligible. But, nevertheless, with further exploration of the Martian and Lunar surfaces, planetary scientists should take into account the possible presence on them of traces of long “sunken” civilizations, in addition to the “remnants” of the existence of life.