![Dark Matter Image source: Martin White Dark Matter Image source: Martin White](http://www.timeone.ca/wp-content/uploads/2013/03/Dark-Matter.jpg)
Classification: concept
Chapter: What's the Matter
Dark matter is most of the matter in the universe. It emits no light. Its presence is deduced from the effects of its gravitational field.
Classification: concept
Chapter: What's the Matter
Dark matter is most of the matter in the universe. It emits no light. Its presence is deduced from the effects of its gravitational field.