Figure 3-32 Orion as Seen in Visible, Ultraviolet, and Infrared Wavelengths (a) An ordinary optical photograph of the constellation Orion. (b) An ultraviolet image of Orion. (c) A false-color view from the I nfrared Astronomical Satellite of the entire Orion asterism. Different colors indicate different intensities of infrared radiation. Clearly, different wavelengths provide different information about various objects in space.