a. Christian Doppler:
b. Galileo:
c. Edwin Hubble:
b. Galileo:
c. Edwin Hubble:
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a. The Doppler effect
b. Theory of gravity (well, the beginnings of one) and the law of inertia
c. Hubble's law.
b. Theory of gravity (well, the beginnings of one) and the law of inertia
c. Hubble's law.