The search for extraterrestrial life is one of the most exciting frontiers in Astronomy. First tentative clues were claimed close to Earth: the weird interstellar object `Oumuamua and the cloud deck of Venus. Our civilization will mature once we find out who resides on our cosmic street by searching with our best telescopes for unusual electromagnetic flashes, industrial pollution of planetary atmospheres, artificial light or heat, artificial space debris or something completely unexpected. We might be a form of life as primitive and common in the cosmos as ants are in a kitchen. If so, we can learn a lot from others out there.
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