Astronomers believe Triton may not have originally formed around Neptune.

Neptune’s third-largest moon, Nereid, could be an intact survivor from the planet’s original satellite system, upending ...

There are hundreds of moons in our patch of space. Some are tiny, some huge; some neatly spherical, some potato-shaped. Some ...

Nature woke up one morning and said, “Geometry.” Otherwise it would digest itself. Your body is basically a biological escape ...

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

The moon dances with the king of the planets, with the horizon as their stage. When you purchase through links on our site, ...

Looking for a sky event this week? Check out our full Sky This Week column. May 21: Check in on Saturn and Mars Tonight we're ...

Venus, now an "evening star," remains the brightest object in the sky after the moon, while Jupiter shines higher above it ...

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