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Why is v lowercase and D uppercase in $v=H_0D$?
Why is v almost always written in lowercase and D in uppercase in $v=H_0D$?
OK, v is in lowercase, as usual, but then why is D in uppercase? What's so different/special about it?
In my physics school ...
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How can Hubble's original data show that the universe is expanding?
The diagram from Hubble's original data only goes from 0 to 2 Mpc (see here), and yet our Local Group is not supposed to be expanding and it is 1.5 Mpc in radius. How can the data show that the ...
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