Cepheids are luminous and can be used to establish both the distances to remote galaxies and the expansion rate of the Universe ( Hubble constant ).
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The new tools are even helping astronomers move closer to their Holy Grail : calculating the Hubble constant, a measure of the universe's rate of expansion.
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The time scale that describes the expansion of the universe is 1 / H with H being the Hubble constant, which itself actually varies with time.
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There have been a lot of reports from the Hubble telescope refining the distances to galaxies, and they keep finding a large value for the Hubble constant,
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Both Hubble studies were aimed at finding the most sought-after number in astronomy, the so-called Hubble constant, which is the rate at which the universe is expanding.
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Cepheids are pulsating stars regularly used to determine galactic distances, and 20 such stars were observed last year to obtain the high Hubble constant reported in October.
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Dividing one by the other gives the Hubble constant _ and with that you have a grip on the rate at which the galaxies are flying apart.
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Classical Cepheids are used to determine distances to galaxies within the Local Group and beyond, and are a means by which the Hubble constant can be established.
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The value of the Hubble constant is estimated by measuring the redshift of distant galaxies and then talk ) 20 : 03, 13 March 2016 ( UTC)
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These unresolved matters have resulted in cited values for the Hubble constant ranging between 60 km / s / Mpc and 80 km / s / Mpc.
