Astro 21.2 - Astro Chapter 21 Section 2 The lives of...

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Astro Chapter 21 Section 2 The lives of galaxies Why do galaxies differ? - all galaxies began similarly - dense then gravity pull into cloud to form stars - two possibilities why galaxies are different o galaxies may have ended up looking different due to slight different conditions in protogalacitc clouds o may have begun their lives similarly but later changed due to interactions with other galaxies - Key question o Why do spiral galaxies have gas rich disk while elliptical galaxies do not? Protogalactic spin – too much spin – spiral galaxy with a disk, too little and no disk form which is elliptical Protogalactic density – high density would radiate energy more effectly and cooled more quickly, allowing rapid star formation. This would not produce a disk. Lower density ones will have a disk because formation is slower.
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This note was uploaded on 12/13/2008 for the course ASTRO 1101 taught by Professor Lloyd,j during the Fall '07 term at Cornell University (Engineering School).

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Astro 21.2 - Astro Chapter 21 Section 2 The lives of...

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