Definitions from Wiktionary (Protoplanetary disc)
▸ noun: (astronomy) Alternative form of protoplanetary disk [(astronomy) A rotating disk of dense gas and dust surrounding a young newly formed star, and from which planets may be formed.]
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▸ noun: (astronomy) Alternative form of protoplanetary disk [(astronomy) A rotating disk of dense gas and dust surrounding a young newly formed star, and from which planets may be formed.]
Similar:
protoplanetary disk,
proplyd,
planetesimal,
protoplanetary nebula,
protoplanet,
accretion disc,
carbon planet,
scattered disc,
protostar,
planetary object,
more...
Opposite:
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