Everything we can see and touch, and quite a lot that we can’t as well, is made of tiny particles called atoms. Some substances, like particles of this iron, contain only one kind of atom. Iron is an ...

There are lots of different substances but only just over a hundred elements. An element is a substance that is made up of only one kind of atom. The atoms in a particular element are the same as each ...

Curiosity has detected a surprising variety of organic molecules on Mars, including compounds tied to the chemistry of life.

NASA's Curiosity rover took this selfie at a site on Mars where it drilled a sample to search for organic molecules in ...