Proplyd
From Infogalactic: the planetary knowledge core
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File:Orion Nebula with proplyd highlights (captured by the Hubble Space Telescope).jpg
Proplyds in the Orion Nebula.
A proplyd, also known as an ionized protoplanetary disk, is an externally illuminated photoevaporating disk around a young star. Nearly 180 proplyds have been discovered in the Orion Nebula.[1] Images of proplyds in other star-forming regions are rare, while Orion is the only region with a large known sample due to its relative proximity to the Earth.[2]
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