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The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula in the southern constellation Musca about 8,000 light-years from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924).
The Stingray Nebula (designated Henize 1357, Hen 3-1357) is the youngest known planetary nebula, located about 18,000 light-years away in the southern constellation Ara.It has a relatively small size (some 0.16 light-year across, one-tenth the size of most other known planetary nebula).However, it is about 130 times larger than our Solar System and is continuously expanding.s the nebula continues to move away from the star, the core of the star â which has become a white dwarf â is heated and illuminates the gas. Forty years ago the Stingray nebula was still a protoplanetary nebula in which the gas had not yet become hot and ionized.