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Tag: universal expansion rate

These galaxies are selected from a Hubble Space Telescope program to measure the expansion rate of the universe, called the Hubble constant. The value is calculated by comparing the galaxies' distances to the apparent rate of recession away from Earth (due to the relativistic effects of expanding space). By comparing the apparent brightnesses of the galaxies' red giant stars with nearby red giants, whose distances were measured with other methods, astronomers are able to determine how far away each of the host galaxies are. This is possible because red giants are reliable milepost markers because they all reach the same peak brightness in their late evolution. And, this can be used as a

How fast is the universe expanding? We may need to recalculate

It's one of the fundamental universal features -- and we're still struggling to understand it.

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© 2007-2023 ZME Science - Not exactly rocket science. All Rights Reserved.