What is the structure of a typical large sunspot?
A) an irregular dark area of uniform darkness
B) a round region of uniformly dark photospheric surface
C) a roughly circular, dark region with a lighter central area, like a bullseye
D) a dark center surrounded by a less dark area
Correct Answer:
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Q93: Sunspots appear dark because they
A) are coronal
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Q95: A typical sunspot group lasts
A) virtually forever.
B)
Q96: The heliosphere is the:
A) region surrounding Earth,
Q99: What is the lifetime of a typical
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