President Donald Trump announced Tuesday he has decided to nominate Jared Isaacman to serve as his NASA administrator, months after withdrawing the tech billionaire's nomination because of concerns about his political leanings.

The comet could be older than our solar system. The comet is also distinct because nickel vapor was detected in the gas surrounding it.

An amateur satellite tracker stumbled across the signal, which is coming from Starshield satellites in a "hidden" part of the radio spectrum.

Starship, the biggest and most powerful rocket ever built, thundered into the evening sky from the southern tip of Texas.

Researchers have spent 10 years improving the massive detectors they use to catch shockwaves from colliding black holes, and now the science is precise enough to test one of Stephen Hawking's key ideas.

Ancient organisms may have left microscopic "biosignatures" on Mars. That's according to NASA scientists, who say a rock sample offers the most concrete proof yet that the red planet once hosted life.

The hottest parts of the sun are its solar flares, and a new study suggests these flares could be more than six times hotter than scientists used to believe.

After a series of failures during recent test flights, SpaceX's massive Starship had a smooth ride for Tuesday's blastoff and successfully deployed some fake satellites.

SpaceX wants to put the two-stage rocket's massive booster through its paces. On Sunday, it postponed the launch "to troubleshoot an issue with ground systems."

A black moon is a type of new moon, when the moon is nearly between Earth and the sun.

It took the capsule 17 hours to make the trip home, experiencing re-entry temperatures of around 3,000 degrees Fahrenheit as it punched through the atmosphere following Friday's ISS undocking.

The Perseids meteor shower is the most popular one of the year. The meteors during this time are characterized by bright fireballs and long "wakes," the streak of light and color that follow behind.

Lovell commanded the mission that almost ended in disaster after an explosion that threatened the crew's oxygen and electrical supply. The inspiring story of their survival was made into a hit movie.

NASA is accelerating plans to have a nuclear reactor on the moon by 2030.

One of the brightest stars in the night sky seems to be orbited by a planet like Jupiter. The news is sure to cheer fans of the Avatar series, which centers on a moon that orbits a fictional gas giant planet in this particular star system.