The primary source of fuel for the sun is
During the Red Giant Stage, how is energy generated in a star's core?
A sunspot cycle begins with
During nuclear fusion in the sun, which of the following occurs?
What did sunspots first reveal about the sun?
To identify the elements in a star's atmosphere, scientists
A star that will live the longest has a starting mass that is
The core of a white dwarf star is mostly made of
Gusts of solar winds can cause
What are solar flares?
A supernova is the explosion of a dying
A black hole is
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