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The Hubble Law using galaxies with
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visible
Cepheid variables.
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from a recent paper by Wendy Freedman and coworkers,
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using
the Hubble Space Telescope
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vr=Hd
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H is 75 km/s/Mpc
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Example:
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If galaxy is 10 Mpc away
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it is moving at 750 km/s
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If galaxy is moving at
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1500 km/s
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it is 20 Mpc away
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