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rgv.edu/weba ke/launchjsp?course, assessment ids223758 18&course; id- 55463 18ccontent, ids 3228964 18step-null a estion Completion status: QUESTION 8 What is a planetary nebula? Oa- Gas ejected from a low-mass star in the final stage of is ie b. Gas created from the remains of planets that once orbited a dead star C. The remains of a high-mass star that has exploded d. Interstellar gas from which planets are likely to form in the not-too-distant future QUESTION9 What would you most ikely find if you returned to our solar system in 10 billion years O a. A neutron star b. A white dwart O C A black hole o d. A pulsar QUESTION 10 What is the CNO cycle? oa The CNO cycle is a series of nuclear o b. The CNO cycle is a series of nuclear reactions that result overalin the fusion reactions that result overall in the fusion of four hydrogen nuclei into one helium nucleus of carbon into nitrogen and axygen c The CNO cycle is a series of nuclear reactions that rosult o d. The CNO cycle is a series overat in the fusion of helium into carbon, nitrogen, and oxygen of nuclear reactions that have produced all the carbon, nitrogen, and axygen in the universe QUESTION 11 what happens to the tarn of a himass star after it runs out of hydrogen?

Explanation / Answer

Question 8. Answer: a

A planetary nebula is a kind of emission nebula consisting of an expanding, glowing shell of ionized gas shaded off from an aged star.

Question 9. Answer: b. White dwarf

In appx 5 billion years, the sun will begin the helium-burning process, turning into a red giant star. Sun will remain as the red giant by 1 billion years. Eventually, it will shed off its outer core and become a white dwarf.

Question 10. Answer: a

The CNO cycle (for carbon–nitrogen–oxygen) is a fusion reaction where stars convert hydrogen into helium.

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