The Universe

Evolution of the Universe

What is the Hubble Constant?

The expansion rate of the universe is called the Hubble Constant in honor of Edwin Hubble, the astronomer who first measured it. Currently the best measured value of the Hubble Constant is about seventy kilometers per second per Megaparsec. That means that, if a location in space is one million parsecs from another location, then in the absence of any other forces or effects, the two locations will be moving apart from one another at the speed of 160,000 miles (260,000 kilometers) per hour.


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