Multiple Choice
A white dwarf star is at what stage of its evolution?
A) protostar phase, just after formation, beginning to generate energy by nuclear fusion
B) main-sequence phase, "middle-aged," generating energy by fusion of hydrogen to helium
C) post-supernova stage, after the explosion of a star
D) very late phase of evolution, no longer generating energy
Correct Answer:
Verified
Correct Answer:
Verified
Q130: In the asymptotic giant branch (AGB) phase
Q131: A nova is an explosion involving a
Q132: Each successive stage of core nuclear reactions
Q133: The center of the remnant of a
Q134: During which phase of a low-mass star's
Q136: Around 2 million years ago, astronomers believe,
Q137: The great breakthrough in understanding the nature
Q138: The existence of stars composed almost entirely
Q139: A planetary nebula is created<br>A) over several
Q140: Helium nuclear reactions (helium fusion) produce primarily<br>A)