## Hubble radiusThe distance from the observer at which the cosmological recession velocity of a galaxy would equal the speed of light – in mathematical terms, c/H_{o}, where c is the velocity of light and
H_{o} is the Hubble constant.
Roughly speaking, the Hubble radius is the radius of the observable universe,
and is believed to between about 11 and 15 billion light-years.## Related category• COSMOLOGY | |||||

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