The Hubble constant H is one of the most important numbers in cosmology because it may be used to estimate the size and age of the Universe. It indicates the rate at which the universe is expanding. Although the Hubble "constant" is not really constant because it changes with time (and therefore should probably more properly be called the "Hubble parameter"). The Hubble constant is often written with a subscript "0" to denote explicitly that it is the value at the present time, but we shall not do so.
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FIGURE: The image to the right, taken with the Wide-Field and Planetary Camera (WFPC2) of the Hubble Space Telescope shows many galaxies (most of the
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