Long before the full moon rises, shifting sunlight transforms the lunar surface into one of the sky's best telescope targets.

NASA's new Nancy Grace Roman Space Telescope is due to be launched into space in a few months on a mission to take far better ...

The final mission before the landmark Apollo 11, Apollo 10 served as a dress rehearsal, testing every aspect of the Moon landing except for the actual landing itself. On May 18, the crew of Commander ...

The team still can't confidently rule out the existence of Europa's water vapor, especially as similar plumes have been more ...

Neptune has a complicated life story, and its moon Nereid might be the only one left standing from the planet’s ...

Astronomers using NASA’s James Webb Space Telescope have uncovered a rare world unlike anything in our solar system — a giant planet about the size of Saturn with surprisingly Earth-like temperatures ...

Europa’s faint glow in ultraviolet light once looked like a possible water plume punching through ice. After 14 years of ...

The prospects of tall, vapory plumes of water gracing Europa's surface caused a huge splash in astronomy—but the very ...

Nereid may be an original Neptunian moon that was pushed outward when Triton entered the system billions of years ago.

Neptune’s far-flung moon Nereid may be the last of the planet’s original companions that managed to survive a cosmic crash, ...

Reanalysis of 14 years of Hubble data has weakened evidence of Europa’s hypothesized water plumes.

A fresh analysis of 14 years of Hubble Space Telescope data has cast doubt on previous claims that Jupiter’s icy moon Europa ...