On Oct. 20, NASA reported that Swift's orbit had decayed to 171 miles (275 kilometers) above Earth and that the roughly 3,300-pound (1,500-kilogram) observatory was no longer able to compensate for ...

Joshua Kutryk will venture outside the International Space Station on Oct. 29, on the first spacewalk by a Canadian astronaut in more than seven years. Here's how to watch it live.

The James Webb Space Telescope captured a spectacular star-forming region glowing 161,000 light-years from Earth in a satellite galaxy of the Milky Way.

Mini-moons are so small that scientists know little about them. For objects between 1 and 10 meters (3.3 to 33 feet) across, models of the near-Earth asteroid population disagree with the numbers ...

Space tourism is about to make a comeback.

Stewart's "Star Trek: The Next Generation" family shared their grief and offered up poignant words to try to describe what effect he had on their lives and profession. "There's no one on this planet ...

The Pentagon's recent spate of UFO releases represent a big shift and are of great benefit to the country, according to disclosure advocate Mike Gold.

On this day in space! Aug. 28, 1993: Galileo spacecraft flies by asteroid Ida on the way to Jupiter only to find a tiny moon!