This preview shows page 1. Sign up to view the full content.
Unformatted text preview: larger than the mass in stars! indicating lots of dark matter a) Clusters contain large amounts of X-ray emitting hot gas b) Temperature of hot gas (particle motions) tells us cluster mass: 85% dark matter 13% hot gas 2% stars 7. Ways to measure or get indication of dark matter a) measure velocity of cluster galaxies b) measure temperature of its hot gas c) gravitational lensing 8. Dark Matter is more than likely made of WIMPS: Weakly Interacting Massive Particles: mysterious neutrino-like particles 9. The gravity of dark matter seems to be what drew gas together into protogalactic clouds, initiating the process of galaxy formation 10. Galaxies appear to be distributed in gigantic chains and sheets that surround great voids 11. Fate of Universe depends on the amount of dark matter. a) Brightness of distant white-dwarf supernovae tells us how much universe has expanded since they exploded b) Accelerating universe is best fit to supernova data...
View Full Document
This note was uploaded on 09/08/2010 for the course ASTR 101 at San Jose State University .
- Dark Energy