Aliens could see Earth passing in front of the sun and notice the chemical footprints of...

Scientists discovered an Earth-like, potentially habitable planet about 3,000 light-years...

Astronomers think the planet, called Proxima c, is a super-Earth that formed far from the...

Because their hydrogen-helium atmospheres balloon out, these planets are nearly as big as...

CHEOPS will attempt to study the atmospheres of exoplanets. It launches into Earth orbit...

NASA and other space agencies are building telescopes that will study dark matter,...