NASA

"For years, he had the field of planetary formation, which he had created, virtually to himself. Most Soviet colleagues were skeptical and uninterested; his research appeared so speculative, so far removed from any evidence."

In the agency's first public report on unidentified anomalous phenomena (UAP), NASA experts admit "we don't know what these UAP are."

Asteroid Dimorphos, which NASA intentionally hit with a rocket during its DART mission in September 2022, is behaving in unpredicted ways.

"We aren’t going to see little green men but rather spectral signatures of these key chemicals, or what we call biosignatures."

One researcher hypothesizes that experiments carried out by NASA's Viking landers in 1976 could have inadvertently killed microbes living in Martian rocks. Other experts are skeptical.

Russia's failed lunar probe mission likely created a crater on the southeastern region of the moon.

OSIRIS-REx is due to make its return to Earth on Sept. 24. Here's everything you need to know about the mission and what it may reveal about the beginning — and the potential end — of life on Earth.

The archetypal planetary nebula imaged by the James Webb Space Telescope now comes in two colorful versions, each showing spectacular features.

The Landsat 8 satellite captured the deadly flames that burned through the town of Lahaina in Hawaii and killed at least 99 people.

Data from NASA's InSight mission shows that Mars's rotation is speeding up and its days are growing slightly shorter. Scientists have a few ideas why.