Significados de planetary nebulae en inglés

The Great Ringmaster pulled planetary nebulae seemingly out of nowhere.

The average radial velocity of 47 planetary nebulae is about 45 km.

Whether the Wolf-Rayet stars have in general been formed from planetary nebulae is a different question: some of them certainly have.

Gravity eventually brings the nebular particles into closer aggregations, and increased collisions finally vaporize the entire mass, forming planetary nebulae and gaseous stars.

Dark Nebulae, star forming Regions or Emission Nebulae, Supernovae Remnants and Planetary Nebulae.

Planetary nebulae with asymmetrical wings of nebulosity are common.

In the stages of concentration the planetary nebulæ might well repeat those through which the greater solar mass proceeded.