More pocked with craters than any other object in our solar system, Jupiter's outermost and second-biggest Galilean moon, Callisto, appears geologically unremarkable. In the 1990s, however, NASA's ...

Reddit user r/JardDog did some impressive heavy lifting for the r/NintendoSwitch2 subreddit. An animation they’ve created of ...

Saturn, Venus, Neptune, Uranus, Jupiter, Mars and Mercury will be visible in an uncommon planetary alignment this month.

For a brief moment at the end of February, every planet will appear in the night sky simultaneously in a rare celestial ...

Planet demographics reveal a puzzling lack of worlds in a certain size range throughout the galaxy F or centuries our solar system was the only planetary system known to humans. We had no proof other ...