Where in the galaxy will we mine lithium?
Lithium plays a key role in modern technology. Astronomers weigh in on where to find it beyond Earth.
What life on Venus would really look like
Space jellyfish make good science fiction, but reality might be even stranger.
How we'd really defend Earth from an asteroid attack
In The Expanse, Earth's defenders must stop a cosmic catastrophe. Scientists weigh in on how to do it.