The most popular idea is that gamma ray bursts

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Unformatted text preview: one pointed at the Earth. Gamma- ray bursts occur in star- forming regions in spiral galaxies, so associated with massive, short- lived stars and hence core collapse. Gamma- ray bursts are associated with Type Ic supernovae. The most popular idea is that gamma- ray bursts represent the birth of black holes, but the birth of magnetars is also considered. Big Bang – the initial expansion of the Universe from a condition of very high density and temperature (“singularity”). Dark Ages – the time after the Big Bang when the Universe had expanded and cooled and there were not yet any stars or galaxies. Gamma- ray bursts and cosmology – gamma- ray bursts are so bright they might be the first objects observable as stars first began to form and die after the end of the “Dark Ages.” Expansion of the Universe – space expands and pulls all distant galaxies apart with a speed that increases...
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This document was uploaded on 02/18/2014 for the course AST 309N at University of Texas at Austin.

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