On January 5, 2005, astronomers at NASA discovered Eris, the second-largest dwarf planet in the solar system. Eris is just ...

The boundary of a solar system is not defined by planets, but by gravity. Beyond Pluto and the Kuiper Belt lies the Oort ...

A solar conjunction occurs as Venus' orbit carries it into alignment with the sun and Earth. Venus will align with the sun ...

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...

While its star projector leaves a lot to be desired, the Science Can Solar System Planetary Projector is a fantastic educational tool for kids, with its solar system model, complete with talking ...

So what is your favorite planet?” As museum educator Melissa Moeller opened up her presentation on the solar system Saturday ...

This article was originally featured on The Conversation. Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A cloud of ...

NASA has unveiled the largest planet-forming disc ever recorded, after capturing striking new images with the Hubble Space ...

The upcoming year will offer a blood-red moon, spectacular meteor showers and the first glimpse of the sun’s corona since ...

NASA has taken a major step toward one of its most ambitious science goals as it searches for signs of life on planets beyond ...