Milky Way: Our home galaxy
Spectrum: a band of colors mades when white light is broken up
Expansion redshift: The shift of a spectrum af galaxy toward longer (redder) wavelengths due to the expansion of space
Big Bang: The beginning of the universe, when the density of the universe was very high
Background radiation: electromacnetic radiation left over from the big bang
Quasar: An extremely bright,extremely distant, high-energy source
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