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Author Question: The fact that the properties of the Universe are close to the dividing line between open and closed ... (Read 47 times)

lracut11

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on: Jul 27, 2018
The fact that the properties of the Universe are close to the dividing line between open and closed Universes refers to the _______________ problem.
 
  Fill in the blank(s) with correct word

Question 2

Why do sunspots occur darker than the rest of the Sun's surface?
 
  What will be an ideal response?


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Ashley I

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Reply #1 on: Jul 27, 2018
Answer to Question 1

flatness

Answer to Question 2

Sunspots are cooler than the photosphere with a temperature of about 4200 K. The photosphere has a temperature of about 5800 K. Because the total amount of energy radiated by a surface depends on its temperature raised to the fourth power, sunspots look dark in comparison.


lracut11

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Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

AmberC1996

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Reply 3 on: Yesterday
Excellent

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