Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

From the smallest stars to the largest planets, discover the cosmic marvels that defy expectations. Learn about the biggest planetary bodies and their place in the universe. Biden commutes 1,500 ...

The Sun makes up 99% of all the mass in the Solar System ... The largest object is the asteroid belt is the dwarf planet Ceres, which is 950km in diameter (that's about the same the length ...

Enceladus, a moon of Saturn, and Europa and Ganymede, moons of Jupiter, are all thought to have saltwater oceans buried under icy shells. Dwarf planets Pluto and Ceres are also suspected of having ...