Leonard David

The U.S. military's X-37B robotic space plane just passed 900 days in orbit on its latest hush-hush mission, adding to the program's flight-duration record.

It's important to start taking action against space junk now, experts say, because Earth orbit is only going to get more congested.

The Long March 5B rocket expected to launch China's Mengtian module on Oct. 31 will likely fall back to Earth uncontrolled a week or so later.

Touching safely down on Mars is a true, nail biting event. Landing securely on Mars remains a delicate balance of technical skill, mixed in with hard-earned luck.

The knowledge that we're not alone in the universe could have far-reaching effects on our view of ourselves and our place in the universe. But it's tough to get more specific than that.

Space life scientists are pushing for the development of an international database on long-term health effects of spaceflight.

Russia's reactivation of lunar exploration via its robotic Luna 25 lander has slipped to 2023.

Researchers are working to come up with ways to mitigate the space junk problem, one of which would use fabrication concepts to reduce the size of debris pieces that make it to Earth.

Given all of the planned international lunar activity, emergencies could happen that will call for the unconstrained mobilization of all possible aids.

The huge, bowl-shaped Meteor Crater in Arizona that was formed some 50,000 years ago continues to yield new information, surprisingly so.

The Galileo Project is the first systematic scientific research program in a search for artifacts or remnants of extraterrestrial technological civilizations.

Rocket Lab aims to send a probe to Venus soon, and a new paper lays out the details of the ambitious mission.

Artemis Base Camp will be established in the moon's south polar region, in a to-be-determined spot that features plentiful sunlight, direct-to-Earth communications and good access to water ice.

Perseverance Mars rover is gathering up samples of Martian rock and soil that could help tease out an answer concerning past life on Mars.

For planetary scientist Alan Stern, witnessing the 20th century deep sea sarcophagus that is the Titanic serves up analogies to spaceflight.

Frank White's "overview effect" has increasingly become iconic for explaining a very human condition attached to the space travel experience.

The Korea Pathfinder Lunar Orbiter, also known as Danuri, is scheduled to launch atop a SpaceX Falcon 9 rocket next Tuesday (Aug. 2).

Bill Ingalls has been a professional photographer for three decades and has served as the Senior Contract Photographer for NASA Headquarters since 1989.

Launching an interstellar probe sounds exceedingly lofty, ambitious, and tough to do. But there's no need to wait for new technology, say advocates.

Scientists searching for signs of extraterrestrial technology should keep an eye out for city lights on exoplanets, a new study suggests.

Valles Marineris, the Grand Canyon of Mars, is ripe for human exploration that can uncover the planet's history and its capacity to sustain microbial life.

Space.com reached out to UFO groups and leading experts in the field to get their thoughts on NASA's new endeavor.

Artemis moonwalkers will need innovative technologies in order to explore more of the lunar surface than ever before and forge the first long-term presence on the moon.

New Horizons is still on duty in extended mission mode, diving ever deeper into the Kuiper Belt to examine ancient, icy mini-worlds in that vast region beyond the orbit of Neptune.

A NASA concept mission called Mars Life Explorer would dig into Red Planet ice, hunting for signs of living organisms.