NOVA scienceNOW Home Past Stories Watch Feedback RSS Teachers Science News
NOVA scienceNOWNOVA scienceNOWNOVA scienceNOWComing up

Dark Matter

Dark Matter

Turns out most of the universe is held together by a mysterious, invisible substance.

arrow The Dark Matter Mystery

In this video dispatch, see how a cosmic collision provides evidence that dark matter really exists.

arrow Ask the Expert

Astronomer Richard Massey answers your questions about dark matter and other enigmas.

Video Extra

What's wrong with how we normally depict atoms?

arrow Picturing Atoms

Hear why orbiting electrons drive Neil deGrasse Tyson batty.

arrow Cosmic Perspective

According to Neil deGrasse Tyson, "dark matter" and "dark energy" could just as well be called "without a clue A" and "without a clue B."