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The '''Hourglass nebula''', also called the the Engraved Hourglass nebula or the Etched Hourglass nebula, is a [[planetary nebula]] in the [[constellation]] of [[Musca]].<ref name=constellation-guide/> Unusual for a planetary nebula, it has two large rings and one smaller one. The [[star]], a white dwarf, at the centre of the nebula is somewhat offset from the exact centre also puzzles astronomers. This throws into question the current belief of how planetary nebulae form, as this would mean the star should be along the axis of symmetry of the nebula.

The '''Hourglass nebula''', also called the Engraved Hourglass nebula or the Etched Hourglass nebula, is a [[planetary nebula]] in the [[constellation]] of [[Musca]].<ref name=constellation-guide/> Unusual for a planetary nebula, it has two large rings and one smaller one. The [[star]], a white dwarf, at the centre of the nebula is somewhat offset from the exact centre also puzzles astronomers. This throws into question the current belief of how planetary nebulae form, as this would mean the star should be along the axis of symmetry of the nebula.

==History==

==History==