Monisha Ravisetti is Space.com's Astronomy Editor. She covers black holes, star explosions, gravitational waves, exoplanet discoveries and other enigmas hidden across the fabric of space and time. Previously, she was a science writer at CNET, and before that, reported for The Academic Times. Prior to becoming a writer, she was an immunology researcher at Weill Cornell Medical Center in New York. She graduated from New York University in 2018 with a B.A. in philosophy, physics and chemistry. She spends too much time playing online chess. Her favorite planet is Earth.
"They are the gold standard tool for the purpose of measuring the distances of galaxies a hundred million or more light-years away," Riess said, calling such measurements"a crucial step to determine the Hubble constant."
So, thanks to Hubble's perch above our atmosphere, the telescope can identify individual Cepheids in galaxies more than a hundred million light-years away, thus measuring the time interval over which these galaxies change their brightness. This diagram illustrates the combined power of the Hubble and Webb space telescopes in nailing down precise distances to a special class of variable star that is used in calibrating the expansion rate of the universe.
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