Tuesday, February 22, 2005

Big Bang


ScientificAmerican.com carries an article titled "Misconceptions about the Big Bang". It is a fascinating read. Some worthy quotes:

#1 "The universe is self-contained. It needs neither a center to expand away from nor empty space on the outside (wherever that is) to expand into."

#2 "Cosmologists sometimes state that the universe used to be the size of a grapefruit, but what they mean is that the part of the universe we can now see--our observable universe--used to be the size of a grapefruit."

#3 "Having a recession velocity greater than the speed of light does not violate special relativity. It is still true that nothing ever overtakes a light beam."

#4 "In an accelerating universe, however, we are surrounded by a boundary beyond which occur events we will never see--a cosmic event horizon."

#5 "The big bang model is based on observations of expansion, the cosmic microwave background, the chemical composition of the universe and the clumping of matter. Like all scientific ideas, the model may one day be superseded."

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