Q
Is there life on other planets?
A
Expert Answer
We don't know. The universe is vast (~2 trillion galaxies), making extraterrestrial life statistically plausible. We've found water and organic molecules on Mars and Europa. However, we've detected no definitive signs of life (biosignatures or technosignatures) elsewhere. The Fermi Paradox asks why we haven't found anyone.
Key Insight
We don't know.
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