![Ground-based image of the Andromeda Galaxy stretches from lower left to upper right. A white arrow points to the location of the Hubble observations. Above the galaxy are four boxes containing Hubble images of the variable star at different luminosities.](https://science.nasa.gov/wp-content/uploads/2023/04/stsci-prc11-15a-jpg.webp?w=4096&format=png)
Hubble Observes Cepheid star in the Andromeda Galaxy
Astronomers use cyclical changes in the brightness of Cepheid stars to determine astronomical distances. The arrow points to a Cepheid star in the Andromeda galaxy observed by Hubble (inset boxes).
Credits: NASA, ESA, Hubble Heritage Team (STScI/AURA), R. Gendler
Image CreditNASA, ESA, Hubble Heritage Team (STScI/AURA), R. Gendler
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