Have you ever wondered just how big space really is? It’s huge. In fact, it’s astronomical! The Colorado Scale Model Solar System depicts the Sun, the planets, and the distances between them all on ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. The size of the solar system is defined by the volume ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

IMAP will launch aboard a SpaceX Falcon-9 on a mission to chart the very edge of the solar system — the heliosphere's boundary— where the Sun's influence yields to the interstellar medium.

Our solar system could be hiding an extra planet in its outermost reaches. It is possible that a giant planet lurks in the Oort cloud, which begins hundreds of billions of kilometres beyond Pluto and ...