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

• Caretta
• Caretta caretta
• Carew
• careworn
• Carex
• Carex arenaria
• Carex pseudocyperus
• carfare
• carful
• cargo
• cargo area
• cargo container
• cargo cult
• cargo deck
• cargo door
• cargo hatch
• cargo helicopter
• cargo hold
• cargo liner
• cargo ship
• cargo ships
• cargo vessel
• carhop
• Cariama
• Cariama cristata