A rare full seven-planet alignment will be visible in the early night sky between Feb. 22 and 28. We have the tips you need to best see all the planets.

The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

But in the grand scheme of the solar system, Earth's Moon isn't as big as you might think. Oberon is Uranus’s second-largest ...

Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune align in a rare celestial event, the last until 2040—coinciding ...

Such events help build interest among kids to study what lies in the Galaxy that they are part of. It’s a way to get the ...