U.S. Department of Energy

Pacific Northwest National Laboratory


A | C | D | E | H | L | N | O | P | S | T | W
Ordinary matter

Stars, planets and all living things are made of matter - everything that makes up the things we ourselves are, as well as what we see and touch. Any object with mass causes gravitational attraction, similar to the way the earth’s mass causes the attraction that holds us to the ground.