The coldest and densest molecular gas clouds in the interstellar medium can have temperatures of 10 K (-505 °F/-263 °C), ...

You might think the space between stars is completely empty, but it’s actually packed with way more stuff than you’d expect. While most of it just whizzes right past us here on Earth (if we’re lucky), ...

This video explains why the vast majority of the universe contains very little matter, exploring atoms, distances between ...