Oxygen isn't the only air life breathes.
"The Times story vindicates the claim that a conspiracy of silence has shrouded the defense department when it comes to [UFOs]."
If we want to find alien life, we shouldn't look for planets like our own.
Could alien life exist on planets outside of the habitable zone?
It could take NASA more than a decade to send a mission to Enceladus.
We know what life as we know it is like. But what about life as we don’t know it?
Because, according to science, alien life is far more than science fiction.
"There is a level of predictability to evolution."
Oceans provide a safe place for life to evolve.
Here, Tyson tackles the most important question ever: Are we alone?
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