Which way is ‘down’ has a different answer depending on where you are on Earth, in the solar system, in our galaxy and beyond ...

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 ...

NASA has confirmed that there are over 6,000 exoplanets floating out there in the galaxy, with another 8,000 exoplanets that ...

Shining in the constellation Gemini near the bright stars Pollux and Castor, Jupiter's opposition is the best time to see the ...

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission arriving in 2026 might solve the mystery.

It was one of humanity’s greater vanities that we ever questioned whether there are any planets in the universe beyond the eight in our little solar system. Our sun is a perfectly ordinary star, ...

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

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 ...

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 ...