MNS 307 Chapter Notes - Chapter 1: Radioactive Decay, Equinox, Antarctic Circle
15 Feb 2014
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Document Summary
Big bang- envisions all energy and matter in the universe as having initially been concentrated in an extremely hot, dense singularity much smaller than an atom. Clusters- groups in which galaxies are found; one cluster could contain thousands of galaxies. Nebula- the collapse of a single, rotating interstellar cloud of gas and dust that includes material that is produced within older stars and dispersed into space when the old stars explode. There are two possible sources for the earth"s oceans: the interior of the earth and outer space. Traditionally, scientists suggested that the water in the oceans and atmosphere originated in the interior of earth in a region called the mantle and was brought to the surface by volcanism. This traditional view is being challenged by a bold new suggestion that large volumes of water are continually being added from outer space.
