Jiansen Lu
Dark matter and dark energy
December 26th 2010 01:03
In cosmology, dark matter does not emit any light and electromagnetic radiation. People can only learn that a large number of dark matter in the universe exists through the gravitational effects . The earliest evidence of dark matter comes from the rotation speed of the spherical galaxy observations. Modern astronomy by gravitational lensing, large scale structure formation in the universe, microwave background radiation and other research show that: normal matter we know only accounts for about 4% of the universe, dark matter accounts for 23% of the universe and there is a 73% dark energy which causes the accelerating expansion of the universe.
Every day there are several trillions of dark matter may pass through your body, but you do not feel that this is because the dark matter cross section is very small.
How to detect live dark matter? Scientists have a lot of ways.
The initial approach is method of astronomical observation, however, can not answer "What is dark matter. " Another way is through dark matter collision with nuclei and producing collision detection signal. While on the ground, because of the number of cosmic rays, direct detection of these signals would interfere with and affect their ability to identify. Therefore, the underground laboratory to help probe the dark matter.
The IceCube Neutrino Observatory at a cost of $271 million in decade, is buried under the South Pole. The observatory is designed to find extremely high energy neutrinos--tiny subatomic particles--originating from supernova explosions, gamma-ray bursts and black holes. Neutrinos are candidates for dark matter.
Video : Dark Matter 3D Map
Dark Matter
Every day there are several trillions of dark matter may pass through your body, but you do not feel that this is because the dark matter cross section is very small.
How to detect live dark matter? Scientists have a lot of ways.
The initial approach is method of astronomical observation, however, can not answer "What is dark matter. " Another way is through dark matter collision with nuclei and producing collision detection signal. While on the ground, because of the number of cosmic rays, direct detection of these signals would interfere with and affect their ability to identify. Therefore, the underground laboratory to help probe the dark matter.
The IceCube Neutrino Observatory at a cost of $271 million in decade, is buried under the South Pole. The observatory is designed to find extremely high energy neutrinos--tiny subatomic particles--originating from supernova explosions, gamma-ray bursts and black holes. Neutrinos are candidates for dark matter.
Video : Dark Matter 3D Map
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