Milky way: our home galaxy.
Spectrum: a band of color made when white light is broken up.
Expansion redshift: the shift of a spectrum of a galaxy toward longer (redder) wavelenghts due to the expansion of space.
Big band: the beginning of the universe, when the density of the universe was very high.
Background radiation: electromagnetic radiation left over from the big band.
Quasar: an extremely bright, extremely distant, high-energy source.
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