I mean, bacterial/animal life probably exists, but we can't really verify that. Anything from radio/optical telescopes that suggested something is in the "habital zone" is really just super long distance guessing.
So will human beings ever be able to verify life elsewhere? (interstellar travel). Even locally, do you think we'll find simple ancient life on Mars someday? Is it likely we'll encounter radio signals from another sapient civilization that made it to the electronics age?
Is interstellar travel even possible? Is life so rare that the planets who have developed it may never find us?
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