The photosphere is the coolest layer close to the Sun, for the radiation of visible light allows it to cool off efficiently.
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Q4: The solar constant refers to that fact
Q5: The sunspot cycle averages about 11 months.
Q6: The granules in the photosphere are about
Q7: Sunspots usually come in pairs of north
Q8: The thickness of the photosphere is about
Q10: The Sun's radius is one astronomical unit
Q11: The prolonged period of few sunspots between
Q12: Observations of sunspots at different solar latitudes
Q13: The Sun's average density is about the
Q14: The Sun's structure is uniform throughout its
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