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glowing cloud of interstellar gas which has been excited by some nearby energy source, usually a very hot star, valgust kiirgav gaasi- ja tolmupilv
emissioonudu . Kosmoseteaduse ja -tehnoloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kth/emissioonudu/1/est (20.06.2026)
