Which of These Important Components Does a Planetary Nebula Contribute $\alpha$

question 88

Multiple Choice

Which of these 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 photoionizes hydrogen. The hydrogen, on recombination, produces the red Balmer-\(\alpha\)light by which interstellar emission nebulae are seen.
• C) rotational motion from the original star, which serves to concentrate interstellar matter into new stars and planetary systems
• D) nuclei of moderately heavy elements, major components of planets such as Earth.