The Black Eye Galaxy (Messier 64), in the constellation Coma Berenices, is a spiral galaxy, visible with even a small telescope. It was discovered in 1779, by Edward Pigott (and independently a month later by Johann Elert Bode and in 1880 by Charles Messier). In a majority of galaxies, the stars all orbit in the same direction. Interestingly though, the gases in the outer region of M64 rotate in the opposite direction of the gases and stars within the inner region. To clarify the scale, the inner region has a radius of 3,000 light years, while the outer region extends an additional 40,000 light years. (That’s big, but take note that M64 is 19,000,000 light years from Earth.) The boundary between the two regions is believed to trigger a very productive birthing ground for many new stars. Astronomers believe that this pattern was caused when M64 absorbed a satellite galaxy brought in on a collision course, approximately 1 billion years, or more, ago.
The darkened band that gives the galaxy it’s nickname is a dust feature that’s obscuring the light from the nucleus of the galaxy.