In keeping with the mother’s name, and the rare astronomical event, the team called the kittens Venus, Mars, Jupiter, Saturn ...

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.

NASA's Pioneer 11 spacecraft left the solar system! This was the second spacecraft to travel beyond the planetary part of our ...

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 ...