The U.S. Air Force will unveil the new Northrop Grumman-built B-21 Raider stealth bomber today (Dec. 2), an aircraft that has been called "the most advanced military aircraft ever built."

Hawaii's Mauna Loa erupts for the first time in decades, a meteorite contains two minerals new to science and a stellar bridge connects two galaxies. These are some of this week's top photos.

The Andromeda galaxy has a history of galactic "cannibalism," the James Webb Space Telescope beholds Saturn's moon Titan and Artemis 1 is officially coming back to Earth. These are some of this week's top stories.

UFOs are making headlines again, but lost in the hype and ruckus is the question of when this all started and how we got to this point.

A new video shows how a team of NASA and European Space Agency spacecraft plan to relay Martian rock samples to Earth.

The aircraft-borne SOFIA telescope could not find signs of a compound possibly linked to biological activity during observations of Venus' atmosphere.

The full moon will appear in very close proximity to a brilliant Mars in the evening of Wednesday (Dec. 7) as the Red Planet reaches opposition.

December's full moon, called the Cold Moon, falls on Dec. 7th and will also see the moon pass in front of Mars, a phenomenon called an occultation.

Disney and Marvel Studios release the first trailer for next year's "Guardians of the Galaxy Vol. 3."

Here are the best space and science fiction movies and TV shows to watch on Disney Plus in December.

A SpaceX Dragon that twice splashed down has now landed for its last time — in Chicago. The spacecraft, which flew to the International Space Station, arrived at the Museum of Science and Industry.