Nearby Galaxy M33
This is a composite image of the galaxy M33 in the constellation Triangulum. It is a collection of 40 billion stars about 3 million light years away. M33 is one of three large galaxies in our local group (including also the Andromeda Galaxy and the Milkway Galaxy). The Barber Research Observatory is monitoring a number of massive stars in M33 as part of a project sponsored by the National Science Foundation (NSP) under grant number 1108890.
The image is a composite of nine separate images taken in three different filters (Blue = Johnson B, Green = Johnson V, Red = Cousins R). Each image was a ten minute exposure with the 20-inch telescope and the U42 CCD camera.