Astronomy 2007 Lecture 8-28

Astronomy 2007 Lecture 8-28 - Ast The universe is finite in...

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Ast 8/28/07 The universe is finite in extent and age. Contrasts between sky and stars are stark Planets are dim and hide close to stars. They reflect light because they do not give of their own light. Planets emit infrared, not light Spiral arms of the galaxy are areas where the gas is being compressed. It is also where stars form Kinetic energy generates heat and the heat is what causes the stars to shine. Planets become more heated and change color on the infrared scale Red stars- just forming Blue stars- hotter stars that are going to burn themselves out When stars explode, dust particles remain. Impressions o The universe is huge w/ an enormous number of stars o Huge distance exists between stars o It looks mostly empty Questions o How large? o What are things made of? o Is the space between stars and planets empty? o On what scale do the planets fit? o Is the universe infinite?
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