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30 great astronomical images: honorable mentions

The September 2003 issue of Astronomy features 30 great images from the past 30 years. Here are some favorites that didn't make the cut.
M17Located about 5,500 light-years away in Sagittarius, M17 is also known as the Swan Nebula and the Omega Nebula. The orange-colored, wave-like patterns of gas have been sculpted and illuminated by a torrent of ultraviolet radiation from young, massive stars, which lie outside the picture to the upper left. Material stripped from these clouds form the thin, green-colored veil of hot gas to the upper left.NASA / ESA / J. Hester (ASU)...

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