The faraway exoplanet could help provide answers as to why there are hardly any planets with twice the diameter of Earth.

SpaceX launches first polar human spaceflight, Fram2, with four astronauts on privately funded orbital mission.

NASA’s NEO Surveyor, a spacecraft specifically designed to detect asteroids that could threaten Earth, is on track for a 2027 ...

The crew of Artemis III will not only reflect the diversity of America but will also be as qualified to walk on the moon as ...