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Protoplanetary disc

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A protoplanetary disc (proplyd) is a disc of dust and gas which orbits a protostar, within a solar nebula. Such discs eventually condense into either asteroid belts, moons, or planets.

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Thomas a Kempis

... which still remains in manuscript. The first printed French copies appeared at Toulouse 1488. The earliest German translation was made in 1434 by J. de Bellorivo and ...

 
 
 
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