Understanding the Universe: An Introduction to Astronomy, 2nd Edition Season 1 Episode 86 The Stuff of the Cosmos
- October 19, 2023
- 31 min
The dark energy that is causing the expansion of the Universe to accelerate makes up about 75 percent of the cosmos. Visible matter accounts for less than 1 percent. The bulk of the remainder is dark matter, most of which may consist of exotic subatomic particles.