Definition of emission nebula in English:

emission nebula

noun

Astronomy
  • A nebula that shines with its own light.

    • ‘The Orion Nebula is an emission nebula, a giant cloud of gas and dust that's lit from within.’
    • ‘Kaylin examined the cloud that was the emission nebula as her ship raced closer and closer.’
    • ‘Resembling a creature on the run with flames streaming behind it, the Spitzer image of a dark globule in the emission nebula IC 1396 is in spectacular contrast to the view seen in visible light.’