| Hubble’s Law and Expansion |
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| Hubble
diagram using m |
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| of
brightest galaxies in |
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| rich
clusters rather than |
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| distance. |
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| Why is this OK? |
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| Bottom
plot is the |
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| famous
“K-z” relation |
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| for
radio galaxies (which |
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| are
always in massive |
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| ellipticals). Really just |
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| another
form of |
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| Hubble’s
Law and |
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| works
to z > 4! |
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