Multiple Choice
The Sun has nearly the same temperature today that it had 4.5 billion years ago, but it is now 30% more luminous. Why?
A) The Sun has a stronger magnetic field today.
B) The Sun has a larger surface area today.
C) The Sun has more sunspots today.
D) Energy took longer to escape the young Sun.
Correct Answer:
Verified
Correct Answer:
Verified
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