Hubble Space Telescope image of RS Puppis, a Cepheid variable star 6,500 light-years away, surrounded by a dazzling reflection nebula. The star's pulsations create a light echo visible in the nebula, allowing astronomers to precisely measure its distance and luminosity. This contributes to a more accurate cosmic distance scale.

Astronomy Picture from 29/08/2018

Nearby Cepheid Variable RS Pup

Source: https://apod.nasa.gov/apod/ap180829.html


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