planetary nebulaplanetary nebula
a glowing, expanding nebula that forms around a collapsing star
Origin of planetary nebulafrom its resemblance, when viewed through a telescope, to a planet
A nebula, often circular or ring shaped, formed by the ejection of the outer layers from a late-stage, low-mass star.
the Cat's Eye nebula
(plural planetary nebulas or planetary nebulae)
- (astronomy) A nebulosity surrounding a dying star, consisting of material expelled by the star.
Coined by William Herschel because of their apparent resemblance to the planet Uranus.