What is the source of the pink glow within the Great Nebula in Orion?
A) a Herbig-Haro object
B) a reflection nebula made of dust
C) young low-mass stars
D) an emission nebula made of gas
Correct Answer:
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Q1: What can initiate the free-fall contraction of
Q2: Which of the following relationships is the
Q4: Which of the following are small luminous
Q5: What happens in the carbon-nitrogen-oxygen (CNO)cycle?
A)Carbon nuclei
Q6: Because they are composed of ionized hydrogen,emission
Q7: How much of its lifetime does the
Q8: What is opacity?
A)the balance between the pressure
Q9: Why is the presence of massive stars
Q10: What happens in the proton-proton chain?
A)Two protons
Q11: What causes the outward gas pressure that
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