As ancient and vast as the Universe is, it seems like some alien race arose in the galaxy long before us, but who rose before ...

Life is incredibly complicated, but for most of Earth’s history it was much simpler. Is it possible the Universe is full of planets with very simple life, and complex organisms are rare?

Is anybody out there? Probably. Most stars have planets; we've discovered more than 6,000 exoplanets thus far, and the most ...

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