Interstellar matter is composed primarily of___________ .
A) oxygen
B) helium
C) ions
D) hydrogen
E) dust
Correct Answer:
Verified
Q6: Fluorescence occurs when_ .
A) visible light is
Q7: Which color stars have the highest surface
Q8: The reason scientists believe the reflective bright
Q9: What was Hubble's major contribution to Cosmology?
A)
Q10: The red color of emission nebulae comes
Q12: Which main- sequence stars are the most
Q13: Which of the following events is not
Q14: Cepheid Variables are stars whose brightness varies
Q15: Fluorescence is a characteristic of _.
A) blue
Q16: Which main- sequence stars are the least
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