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An artist's impression of the seven planets of the TRAPPIST-1 system. Most are rich in volatile materials such as water.

TRAPPIST-1 Worlds Are Rocky and Rich in Water, New Research Uncovers

Dwarf galaxies, such as the one captured here by the Hubble Telescope, are actually one of the most common types of galaxy in the universe.

Interstellar Travel Requires a Long-Term Approach (and Humans Are Too Impatient)

Gamers around the world helped physicists crowdsource a reality check.

Biggest Test Yet Shows Einstein Was Wrong About ‘Spooky Action at a Distance’.

The Milky Way and Andromeda galaxies.

The Andromeda Galaxy Is Not Bigger Than the Milky Way After All.