Dark Matter How Hot Is
Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total energy density. The majority of dark matter is thought to be non-baryonic in nature, possibly being composed of some as-yet undiscovered subatomic particles. [a] Its presence is implied in a variety of astrophysical observations, including gravitational effects which cannot be explained by accepted theories of gravity unless more matter is present than can be seen. For this reason, most experts think dark matter to be abundant in the universe and to have had a strong influence on its structure and evolution. Dark matter is called dark because it does not appear to interact with observable electromagnetic radiation, such as light, and is thus invisible to the entire electromagnetic spectrum, making it extremely difficult to detect using existing astronomical instruments.
Other Popular:
- Esa Tikkanen Oilers
- Apollo Astronauts On Moon
- Blue Nebula Photography
- Real-time Asteroid Tracking
- Nasa Jpl Mars Cover
- Printable Comet Asteroid
- Nasa Orbital Space Plane
- Videos Of Nasa Apollo 11
- Planet Discovered Larger Than Earth
- Hubble Wallpaper 1440x900
- First Few Black Hole Candidates
- Mms Nasa Spacecraft
- Green Galaxy Nebula
- Elliptical Galaxy Nasa
- Nasa Glenn Tours
- Mette Asteroids Galaxy Tour