Assertion: andromeda galaxy's star | /r/Synonym | a cepheid variable
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Source sentences:
text: V1 is a special class of pulsating star called a Cepheid variable that can be used to make reliable measurements of large cosmic distances.
text: (100″) telescope, Hubble produced photos that showed parts of spiral nebulae to be collections of individual stars, while he also used stars called Cepheid Variables to calculate the distance to the Andromeda Galaxy, using parallax measurements.
text: The discussion wasn't concluded until 1925, when Edwin Hubble identified a special kind of star known as a Cepheid variable
text: V1 is a special class of pulsating star called a Cepheid variable that can be used to make reliable measurements of large cosmic distances.