galaxy: a large group of stars held together by the gravity.
milky way: our home galaxy.
spectrum: a band of colors made when light white light is broken up.
expantion redshift: the shift of a spectrum of a galaxy toward longer (redder)wave lents to do the expansion of space.
big bang: the bigining of the univers, when the densyty of the universe was very haight.
background radietion: electromagnation radiotion left over the bing bang,
quasar: an extrimly bright, extrimly distant,hight energy source.
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