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Unformatted text preview: see how far the galaxy has traveled, in how long. Let's measure this speed in more familiar units: Roughly, 10 Mpc = 3 x 10 20 km, and 1 billion years = 3 x 10 16 s. So in classroom units, 1 tile / time interval = 10 Mpc / 1 billion years = 1 x 10 4 km/s. Now, suppose that the present time is time 4. Note the distance to each of the other three galaxies, and how fast each galaxy is moving. Is there a linear relationship? Can we make our own form of Hubble's Law?: v = H d In our classroom universe at time 4, what is the value of H ? This exercise contained identical worksheets, for people living on the green, blue, and purple galaxies. In spite of making measurements from different galaxies, everyone should have gotten the same result for the Hubble constant!...
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 Fall '10
 FILIPPENKO

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