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M27 - Dumbell Nebula
A planetary nebula with a white dwarf star in the center. This is the remnant of a star, much like our sun, that has exhausted its fuel and threw out its contents into space in several last gasps or puffs that expanded out in multiple shells. A 5min exposure reveals at least four such bursts, each tens of thousands of years younger than the next farther one out, where longer exposures reveal even more that are much older.