An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy ultraviolet photons emitted from a nearby hot star.

Emission nebula, in astronomy, a bright, diffuse light sometimes associated with stars whose temperatures exceed 20,000 K. The excitation process necessary to provide observed optical and radio energies in such gaseous regions was long an astronomical puzzle.

2024年7月27日 · A famous example of an emission nebula is the Orion Nebula, a huge, star-forming nebula in the constellation Orion. The Orion Nebula is home to a star cluster defined by four massive stars known as the Trapezium.

An Emission Nebula is a cloud of dust and gas in space that shines naturally due to the gas being lit up by a light source within the nebula. A planetary Nebula is a form of Emission Nebula.

Emission nebulae are clouds of ionised gas that, as the name suggests, emit their own light at optical wavelengths. Their mass generally ranges from 100 to 10,000 solar masses and this material can be spread over a volume of less than light year to several hundred light years.

2021年5月14日 · Emission nebulae are bright, diffuse clouds of ionized gas that emit their own light. The bright star V565 (center of the image) highlights a silvery, fan-shaped veil of gas and dust, while the right half of this image is obscured by a dense cloud of dust.

2021年11月1日 · Nebulae are some of the most resplendent objects in the universe, but it’s easy to confuse which one is an “emission nebula,” and which one is an “absorption nebula.” Thankfully, this “Field Guide” will give you a quick rundown so you can impress all of your friends with your Nebulae Knowledge!

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The magnificent emission region, the Orion Nebula (aka M42), lies at the upper right of the picture. Immediately to its left are a cluster of of prominent bluish reflection nebulae sometimes called the Running Man. The Horsehead nebula appears as a dark cloud, a small silhouette notched against the long red glow at the lower left.

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