Astronomy

A superhero plant that could thrive on the Red Planet.

Post-apocalyptic star systems could reveal the fate of our own.

How our inhospitable neighbor can help us find life elsewhere.

Is gravity weaker over distances of billions of light-years?

Inside the hunt for habitable planets.

Bright ideas from astronomy’s biggest stars haven’t always worked out.

What a missing element can teach us about the universe.

The importance of feeling small and insignificant.

Recent controversies bode ill for the effort to detect life on other planets by analyzing the gases in their atmospheres.

Asteroid defense gets serious.

A controversial theory can explain phenomena attributed to the mystery planet.

Cassiopeia A gets a close-up.