A)Molecules such as NH3 and CH4, which contribute to giant molecular clouds
B)UV light that photoionizes H. This H, 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
D) is definitely correct.
I seem to remember that I have read about evidence for A) but it seems unlikely B) and C) are incorrect.
December 10th, 2009 at 5:04 pm
D) is definitely correct.
I seem to remember that I have read about evidence for A) but it seems unlikely B) and C) are incorrect.
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