Astronauts and robotic spacecraft have captured breathtaking photos of Earth from space for decades. See the best images.

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with ...

Astronomers have long been puzzled by a cosmic mystery: planets orbiting two stars—like Star Wars’ Tatooine—are surprisingly rare, even though they should be common. New research suggests the culprit ...

SPHEREx detects massive deposits of frozen CO2 in star-forming regions and reveals new insights into planet formation.

Astronomers used the James Webb Space Telescope to probe the object, gathering clues on whether it grew larger over time like ...

An accounting of all the water that should have been and gone on Mars’s surface has come up with a discrepancy that shows just how little we understand the Red Planet’s hydrological history A billion ...