Dumbbell Nebula

The Dumbbell Nebula was the first planetary nebula to be discovered, found by Charles Messier in 1764. Its distinctive double-lobed shape gave rise to the “dumbbell” name; in three dimensions it is more like a flattened cylinder or apple core seen from the side.

The central white dwarf, one of the hottest known at approximately 85,000 K, illuminates the surrounding nebula brilliantly. The two bright lobes contain the densest ionized gas, while the fainter outer shell extends in a more complete sphere around them — the dumbbell appearance is primarily a projection effect of a denser equatorial torus against a thinner surrounding shell.

Hubble’s close-up imaging reveals extraordinary detail in the nebular structure: thousands of dense, gaseous globules embedded in the bright shell, many with cometary tails pointing away from the central star. Similar to the Helix Nebula’s cometary knots, these represent regions where cooler, denser gas has survived the ionization front.

The nebula is expanding at roughly 31 km/s. Its age is estimated at approximately 9,800 years based on this expansion rate and its current angular size.