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Which of the following important components does a planetary nebula contribute to the interstellar ...

Which of the following important components does a planetary nebula contribute to the interstellar medium?
A)   Molecules such as NH3 and CH4, which contribute to giant molecular clouds
B)   UV light that photoionizes hydrogen. This hydrogen, upon recombination, produces the red Balmer- light by which we see interstellar emission nebulae
C)   Rotational motion from the original star, which serves to concentrate interstellar matter into new stars and planetary systems
D)   The nuclei of moderately heavy elements, major components of planets such as our own

Textbook

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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