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The Milky Way (Spiral Galaxies). Spiral Galaxies. Thin Disk (~30 kpc in diameter and ~1 kpc thick) of stars, gas, and dust: open c lusters, young stars. Sun is located 8 kpc away from the Galactic Center Thick Halo of stars with little gas or dust: globular clusters, old stars
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Spiral Galaxies • Thin Disk (~30 kpc in diameter and ~1 kpcthick) of stars, gas, and dust: open clusters, young stars. Sun is located 8 kpc away from the Galactic Center • Thick Haloof stars with little gas or dust: globular clusters, old stars • TheBulge (~1 kpc) is the center of the galaxy where the inner halo & the disk merge together: a supermassive (>106 solar mass) black hole in the center.
The Problem of Absorption • Interstellar space is filled with gas and dust • This dust absorbs and scatters starlight passing through it, • This makes more distant objects look fainter than they otherwise would be if there were no interstellar dust. • Blocks out light from distant stars.