With sapphire waterfalls, lava rain and orbits around dead stars, these distant worlds push the limits of what’s possible.

It's estimated there may be trillions of rogue planets wandering through the Milky Way, unbound to any star. Since detecting ...

Thanks to the discovery of thousands of exoplanets to date, we know that planets bigger than Earth but smaller than Neptune ...

The International Astronomical Union (IAU) held its third NameExoWorlds contest, resulting in the adoption of proper names for 20 exoplanetary systems. The contest involved over 8,800 participants ...

This transcript was prepared by a transcription service. This version may not be in its final form and may be updated. Danny Lewis: Almost 800 million miles away from Earth, the moon Enceladus orbits ...

If you step back in time, thousands of years ago, people knew about the brightest planets pretty much everywhere. These are Mercury, Venus, Mars, Jupiter and Saturn. And pretty much every culture knew ...

Astronomers just measured the mass of a free-floating planet without a star for the first time ...

Stargazers who have heard of an amazing planetary alignment coming later in January may be in for a letdown if they look up at the night sky expecting to be dazzled. Yes, six planets will be visible ...