Figure 6-27: Orion Seen at Ultraviolet, Infrared, and Visible Wavelengths (a) An ultraviolet view of the constellation Orion was obtained during a brief rocket flight in 1975. This 100-s exposure covers the wavelength range 125–200 nm. (b) The false-color view from the Infrared Astronomical Satellite displays emission at different wavelengths in different colors: red for 100-μm radiation, green for 60-μm radiation, and blue for 12-μm radiation. Compare these images with (c) an ordinary visible-light photograph and (d) a star chart of Orion.

(a: G. R. Carruthers, Naval Research Laboratory; b: NASA; c: mike black photography/Flickr/Getty Images)