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Article: ASTRONOMERS FIND RING OF DARK MATTER WITH HUBBLE SPACE TELESCOPE
- Article from:
- US Fed News Service, Including US State News
- Article date:
- May 15, 2007
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NASA issued the following press release:
Astronomers using NASA's Hubble Space Telescope have discovered a ghostly ring of dark matter that formed long ago during a titanic collision between two galaxy clusters. Dark matter makes up most of the universe's material. Ordinary matter, which makes up stars and planets, comprises only a small percent of the universe's matter. The ring's discovery is among the strongest evidence yet that dark matter exists.
Astronomers have long suspected the existence of the invisible substance and theorized that it is the source of additional gravity that holds galaxy clusters together. Such clusters would fly apart if they relied only on the gravity from their ...