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- Dark energy - "... 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 currently accounts for 73% of the total mass-energy of the universe." - Wikipedia
- Dark matter - "dark matter is matter that is inferred to exist from gravitational effects on visible matter and background radiation, but is undetectable by emitted or scattered electromagnetic radiation... dark matter accounts for 23% of the mass-energy density of the observable universe. In comparison, ordinary matter accounts for only 4.6% of the mass-energy density of the observable universe, with the remainder being attributable to dark energy." - Wikipedia
- FOR KIDS: The dark side of the universe - "Most of the cosmos is invisible, but that doesn't stop scientists from searching for it" - Science News - April 27, 2011
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