关于这张图
Galaxy NGC 5866 lies 44 million light-years from Earth and has a diameter of roughly 60,000 light-years — a little more than half the diameter of our own Milky Way galaxy. From our viewpoint, NGC 5866 is oriented almost exactly edge-on, yielding most of its structural features invisible. Spitzer detects infrared light, and the red color here corresponds to a wavelength typically emitted by dust. The clean edges of the dust emission from NGC 5866 indicate that there is a very flat ring or disk of dust circling the outer region of the galaxy. Spitzer took this image during its "cold" mission, …
