Our moon is not the biggest moon in the solar system — not by a long shot. In fact, the Moon is only the fifth biggest satellite in our solar system, wedged right between Io and Europa in size. The ...

As NASA's Voyager 1 and 2 unmanned deep space probes head out of the Solar System, they are in territory that is the very definition of "uncharted." To help fill in the map, the Hubble Space Telescope ...

Gareth Dorrian does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

So if our solar system is more or less flat in terms of the planetary rotations around the sun (I'm using typical pictorial depictions of the solar system), what is up and down from our solar system ...

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 ...

This story is part of Short Wave's series Space Camp about all the weird, wonderful things happening in the universe. Check out the rest of the series. If you were born in the last century you might ...

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 ...