Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps


Noun: planetary nebula
  1. A nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star

Derived forms: planetary nebulae

Type of: nebula

Encyclopedia: Planetary nebula

Nearest

Planera
planet
planet gear
planet wheel
planetal
planetarium
planetary
planetary gear
planetary house
planetary mixer
planetary nebula
planetary science
planetesimal
planetesimal hypothesis
planetoid
planetology
plane-tree family
plangency
plangent
planimeter
planing machine