COVER Three views of the Milky Way, at different wavelengths and length scales: top, an inverted infrared image of the entire disk; middle, an optical image of the southern band of the disk with color enhancements; and bottom, a radio image of the Galactic center. These state-of-the-art snapshots of the structure of our Galaxy, and the evolution and future of our home spiral, are discussed in a special section starting on p. 61 [Images: top, NASA Goddard Space Flight Center and COBE Science Working Group; middle, John Gleason/Celestial Images; bottom, N. E. Kassim and collaborators, Naval Research Laboratory]

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