RR Lyrae variable stars

In this video, NSF–DOE Vera C. Rubin Observatory showcases 46 subtly pulsating RR Lyrae variable stars in an early glimpse of the dynamic sky Rubin will reveal. Over the next 10 years, Rubin will detect up to about 100,000 of these stars extending out to more than a million light-years away, allowing scientists to map the outer reaches of our Galaxy and explore the structure of the Galactic halo that surrounds the Milky Way and extends nearly halfway to our closest neighbor, the Andromeda galaxy.