Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions of years ago. The find ...

Ganymede is the largest moon in our solar system ... Dwarf planet Ceres is shown in these false-color renderings, which highlight differences in surface materials. Ceres is less a ball of rock ...

When I was a kid, there were nine planets. Now we know of thousands! But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might ...

So, during the summer of 2006, members of the International Astronomical Union convened in Prague to reconsider what counts as a planet in our solar system. IAU members decided that there were ...

“It’s completely plausible for our solar system to have captured such an Oort cloud planet,” says Nathan Kaib, a co-author on the new work and an astronomer at the Planetary Science Institut ...

Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar ...

“If these huge planets act like bowling balls cruising through our solar system, they can disrupt, protect or, in a sense, do both to planets like ours. Therefore, better understanding their ...

However, because the solar system’s planets don’t all perfectly ... calibrating astronomical instruments. And when planets do truly align in 3D space, exploration missions, particularly ...