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

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 ...

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 ...

Just about everything we encounter in our day-to-day lives fits that definition ... But as usual in science, there's more to the story. On human scales of mass and distance, matter obeys the ...