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Among Trillions of Planets, Are We Home Alone?
In a galaxy that likely holds trillions of planets, ours is so far the only known life-bearing world. Are we really alone?
more Life in the Universe: What are the Odds?
We don t know when, or even if, we ll find life beyond Earth, but NASA scientists continue the hunt among the thousands of exoplanets confirmed in the galaxy so far.
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What s Out There? The Exoplanet Sky So Far
We ve confirmed only a few thousand of the galaxy s exoplanets, which probably number in the trillions – and already, the variety is stunning.