Trans-Neptunian objects (TNOs) are icy bodies that vary widely in size, from large dwarf planets like Pluto and Eris—each ...

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but with a telescope you can spot Neptune and Uranus.

Explore Ceres, the largest asteroid in our solar system, and discover its remarkable ancient ocean and ice-rich crust.

For decades, we believed there were nine planets in our solar system—until Pluto was reclassified in 2006. But what if ...

Asteroids that orbit close to the Earth inevitably cause us some anxiety due to the even remote possibility of a collision.