Nebula
A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
Nebulae are often stellar nurseries where new stars are born, or the remnants of dead stars. They come in various forms, including emission nebulae (glowing), reflection nebulae (reflecting starlight), and dark nebulae (obscuring light).
Word relationships
- Cosmic cloud: A more general, less scientific term for a nebula.
Commonly confused with
- Galaxy: A nebula is a cloud of gas and dust, often within a galaxy. A galaxy is a vast system containing billions of stars, gas, and dust.
Word family
- nebular (adjective): Relating to or resembling a nebula.
Collocations
- emission nebula
- reflection nebula
- dark nebula
- planetary nebula
- stellar nebula
Example sentences
- "The Orion Nebula, a vibrant stellar nursery, is one of the brightest and most studied objects in the night sky." Describing a cosmic formation.
- "New stars are formed from the gravitational collapse of dense regions within a nebula." Explaining a scientific process.
Memory hook
Imagine a 'NICE BLUR' in the sky. Nebulae are blurry clouds of gas and dust. Cloud Blur
When not to use
Do not confuse a 'nebula' with a 'galaxy' (a system of billions of stars) or a 'planet'. It specifically refers to clouds of gas and dust.
Fun facts
- The Crab Nebula is a famous supernova remnant, the expanding cloud of gas left behind after a star exploded.
- Some nebulae are so large that light takes hundreds or even thousands of years to travel across them.
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