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Depth in the Messiers

Some Messier objects are great targets for 3-D observing.
In the June 2003 issue of Astronomy, James Mullaney provides cues from certain celestial objects that can improve your ability to view celestial targets in 3-D. Provided below are some of these objects from the Messier catalog that Mullaney recommends for adding depth to your observing.The Lagoon Nebula (M8) Approximately 5,200 light-years away, the Lagoon Nebula was first observed by Charles Messier on May 23, 1764....

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