Photo: N. Caldwell, B. McLeod, & A. Szentgyorgyi (Harvard-Smithsonian CfA)
Triangulum Galaxy - M33
The center of the Triangulum Galaxy is filled with older, yellow, long-burning stars. Younger, blue, fast-burning stars populate the spiral arms, creating waves of star formation that ripple around the central disk. Astronomers see the same processes and life cycles of stars in these nearby galaxies that they see in our own.
