Hot gas fleeing a dying star 3,800 light-years away in the Scorpius constellation. A so-called planetary nebula, it is also known as the Bug Nebula or the Butterfly Nebula. What resemble dainty butterfly wings are actually roiling cauldrons of gas heated to more than 36,000 degrees Fahrenheit. The star itself, once about five times as massive as the Sun, is some 400,000 degrees Fahrenheit, making it one of the hottest known in the galaxy. In what amounts to a kind of galactic recycling, the lost gas, enriched by elements like oxygen, nitrogen and carbon produced by the formerly massive star, will form the stuff for future stars.
from here
