Hubble Space Telescope Measures Precise Distance to the Most Remote Galaxy Yet (1994)
1994 · Short film
Synopsis
*Description*: This sequence of images taken with NASA's Hubble Space Telescope chronicles the rhythmic changes in a rare class of variable star (located in the center of each image) in the spiral galaxy M100. This class of pulsating star is called a Cepheid Variable. The Cepheid in this Hubble picture doubles in brightness (24.5 to 25.3 apparent magnitude) over a period of 51.3 days. The interval it takes for the Cepheid to complete one pulsation is a direct indication of the stars's intrinsic…
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