One of Mars' tallest volcanoes peeps over a thick layer of clouds, in Odyssey’s first picture of Arsia Mons peering over the Red Planet's horizon.

How a robot built to walk on alien ice got the cold shoulder—and then (possibly) lived to see another day.

The unusual astronomical skirmish offers new insight into the dynamics of such collisions.

The findings suggest black holes could provide a cheaper, natural alternative to billion-dollar particle colliders, if we can figure out how to harness them.

A 600-year-old stellar event described in cryptic language finally gets a scientific ID.

Mars is not safe either.

A curious question sparked a cosmic deep dive into why light never tires—even after 25 million years on the move.

Scientists have been arguing about the origin of strange streaks on Mars since the earliest missions to the Red Planet.

This was the company's second attempt to land on the Moon, with both missions having toppled over on the lunar surface.

The spacecraft’s expected area of reentry spans vast regions on both sides of the equator, where it could potentially land in a single piece.

The spacecraft suffered an engine anomaly that left it stuck in Earth's orbit for decades, and now it's slated for an uncontrolled reentry.

Spacesuit parts are being tested in a cryogenic ice chamber to see how well they would fare in the lunar south pole.

A stellar occultation this month gave scientists an opportunity to scrutinize the seventh planet from the Sun.

The recoverable spacecraft reentered off the coast of Brazil in the Atlantic Ocean instead of the Indian Ocean, and therefore could not be recovered.

"I basically spent three years trying to prove this wrong. And I couldn’t prove it wrong."