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Astro 20.1 - Astro 101 Chapter 20 Section 1 Island of Stars...

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Astro 101 Chapter 20 Section 1 Island of Stars Observable universe contains over 100 billion galaxies. Galaxies come in many shapes and colors and sizes Cosmology – study of overall structure and evolution of the universe Three major categories of galaxies: Spiral – such as MW, look like flat white disk with yellowish bulge at centers. Elliptical – redder more round, often elongated Irregular galaxies – not dislike nor rounded Dwarf galaxy contain 100 million stars, Giant galaxy 1 trillion stars Spiral: Disk population includes stars of all ages and masses Spheriodal population consists of halo and bulge stars. Halo stars are old and low in mass. Disk component always contains an interstellar medium of gas and dust.
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