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

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 ...

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.

If you're looking for something to do Memorial Day weekend and into May, here's how to spot a band of stars comprising the ...

Scientists used Hubble, Keck and Webb to show Uranus's faint outer ring is made of tiny water-ice grains from moon Mab, ...

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

After 40+ years of development, design, construction, and delays, the Hubble Space Telescope launched on April 24, 1990, on ...

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