How did Hubble use cephaid variable stars to measure the distance of galaxies? I know they...

How did Hubble use cephaid variable stars to measure the distance of galaxies? I know they pulsate in a predictable way, how is this measured?

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Expert Solution

cepheid are stars which brighten and dim periodically. This property allows them to be used as the comic yardstick to find the distance. They have a relationship between their luminosity and pulsation period.

in order to find the distance cepheid variables are used. cepheid variables are intrinsic variables which pulsate in a particular way their period is directly related to luminosity.

Its luminosity is measured by the behaviour of cepheid variables and is calculated by distance modulus equation

m - M = 5 log d - 5

where m = apparent magnitude of the object

M = absolute magnitude of the object

d = distance of the object in parsec.

genius_generous answered 1 year ago

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