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

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

What can the vapor plumes on Jupiter’s moon Europa teach scientists about the small moon’s atmosphere? This is what a recent ...

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

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

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

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 ...

A striking new image of the Whirlpool Galaxy is helping astronomers solve one of the biggest mysteries in star formation.

From this vantage point looking at the Milky Way from its edge, the galactic bulge might appear as a glowing orb of stars, ...

Venus and the moon will appear together in the sky May 18 in a celestial conjunction visible across the US. Here's what to ...