Vocabulary: absolute brightness, absorption spectrum, apparent brightness, Big Bang theory,

blueshift, Cepheid variable, Doppler shift, Hubble constant, Hubble’s law, luminosity,

megaparsec, period, redshift, spectrograph

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

Standing by the side of a lonely highway at night, you see two motorcycle headlights, one in

each direction. The headlight on your left appears brighter than the one on your right.

1. If the headlights are equ...
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