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The Whirlpool Galaxy, more familiar as M51, is just one of the Messier Objects you can find during the TVS Messier Marathon challenge. Also catalogued as NGC5194, the Whirlpool is located approximately 15 million light years distant in Canes Venatici. The smaller galaxy appearing here below the spiral of M51 is believed to be behind it, from the perspective of Earth. This relationship is inferred because the dust in M51's spiral arm reddens and partially blocks the light from the smaller galaxy. For information on the club Messier Marathon, see Dave Sworin's feature story beginning on page 5. (NASA photo, Hall Telescope, Lowell Observatory, Bill Keel.)
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