The rate of the universe's expansion is proving to be elusive for scientists, who found three ways to arrive at that rate. A new study reveals the latest method: red giant stars. Instead of being an expected tiebreaker, the new rate raises more questions.
The universe is expanding, but the rate of that expansion is proving to be elusive. A new measurement of the universe's expansion rate falls between two previously established rates, leading to more questions than answers.
About a century ago, Carnegie Institute of Science astronomer Edwin Hubble made the discovery that the universe had continued to grow after the Big Bang. But the rate of that expansion, deemed the Hubble constant, is difficult to determine. Objects in the universe can act like mile markers, so understanding their distance allows for the measurement of the speed at which they're moving away from us. The ratio of dividing that distance by velocity can determine the Hubble constant.
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