A typical sunspot group lasts
A) virtually forever.
B) about two months.
C) 11 years.
D) 22 years.
Correct Answer:
Verified
Q90: The solar wind is
A) the flow of
Q91: Astronomers have recently compared the relative abundances
Q92: What is the structure of a typical
Q93: Sunspots appear dark because they
A) are coronal
Q94: How does the number of sunspots on
Q96: What is the average length of
Q97: The Stefan-Boltzmann law indicates that the energy
Q98: Sunspots are
A) cooler, darker regions on the
Q99: Other stars
A) have never been detected producing
Q100: What is the solar wind?
A) storm of
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