We all know our galaxy, the Milky Way, is big.
Astronomers aren't exactly sure, precisely. However, a study of galaxies in the Virgo Cluster accidentally turned up a population of stars in the outer part of the Milky Way. They may answer those questions.dark matter
RR Lyrae stars are interesting in their own right, even beyond their role here as distance indicators. They have specific physical properties that cause them to expand and contract in a regularly repeating cycle. It's almost like a heartbeat. This image from European Southern Observatory shows several RR Lyrae stars. They typically reside in ancient stellar populations over 10 billion years old, in globular clusters, and in the halo. Astronomer Raja GuhaThakurta of the University of California Santa Cruz pointed out that studies of this new population of RR Lyraes carried out by student Yuting Feng clarify the"edge" of the Milky Way.
GuhaThakurta also explained that the galactic stellar halo is much bigger than the disk. It's about 100,000 light-years across. The halo also contains the oldest stars in the galaxy. It extends for hundreds of thousands of light years in every direction. The survey was proposed to study a variety of factors of the cluster, including mass, the intracluster medium, the fossil record of star formation in the cluster, and studies of galaxy haloes.
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