Cartwheel Galaxy Photo from National Geographic

This false-color view of the Cartwheel galaxy was created by combining images captured by four space telescopes: Galaxy Evolution Explorer, Hubble Space Telescope, Spitzer Space Telescope, and Chandra X-ray Observatory. Astronomers think a smaller galaxy, possibly one of two galaxies seen here (bottom left), passed through the center of the Cartwheel galaxy about 100 million years ago.Photograph courtesy NASA/JPL-Caltech

Taken in its entirety for educational purpose at http://science.nationalgeographic.com/science/enlarge/cartwheel-galaxy.html