Newly Found Stars are Technically in the Milky Way, but They're Halfway to Andromeda - by spacewriter
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. Courtesy ESO/VVV Survey/D. Minniti.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.
“The halo is the hardest part to study because the outer limits are so far away,” GuhaThakurta said. “The stars are very sparse compared to the high stellar densities of the disk and the bulge, but the halo is dominated by dark matter and actually contains most of the mass of the galaxy.”So, how to study this part of the galaxy if it’s so tough? And where do the RR Lyraes come in? Yuting Feng used survey studies of galaxies into dig out data about stars in our own galaxy and its halo.
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