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The AstronomersAstronomy: Dark Matter and Dark Energy
Astronomy: Dark Matter and Dark Energy
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Dark Matter, In astronomy and cosmology, dark matter is a form of matter that is undetectable by its emitted electromagnetic radiation, but whose presence can be inferred from gravitational effects on visible matter and background radiation. According to present observations of structures larger than galaxies, as well as Big Bang cosmology, dark matter accounts for the vast majority of the mass in the observable universe. Dark Energy: In physical cosmology, astronomy and celestial mechanics, dark energy is a hypothetical form of energy that permeates all of space and tends to increase the rate of expansion of the universe. Dark energy is the most popular way to explain recent observations and experiments that the universe appears to be expanding at an accelerating rate. In the standard model of cosmology, dark energy currently accounts for 74% of the total mass-energy of the universe.
Added on Nov 27, 2012 by lonewolf
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Time: 07:43 | Views: 368 | Comments: 0
   
  Extragalactic astronomy  
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