How is matter different from mass? These and other questions about the deepest levels of physics, answered inside.

The state of matter is a deceptively simple concept. It turns out that any material, no matter what it is made of, can exist in one of three forms: solid, liquid or gas. These are categories of ...

All our cosmological observations seem to suggest that normal matter we can see – the sort that makes up you, me, the planet we live on, the sun our planet orbits and the galaxy we all exist in ...