Author Question: What is the best time to see the corona? Why is it so faint, if it is so hot? What will be an ... (Read 62 times)

jon_i · **on:** Jul 27, 2018

What is the best time to see the corona? Why is it so faint, if it is so hot?

What will be an ideal response?

Question 2

If we could watch spiral arms from a telescope situated above the Milky Way over 500 million years, what would we see happen?

A) Stars will move through the spiral arms, bunching up closer as they pass through. Young hot stars will form and die within the arms before having a chance to move out.
B) The spiral arms will eventually unwind, as centripetal forces send the stars flying outwards into intergalactic space.
C) The spiral arms will eventually dissipate and fade away, since they are a temporary phenomenon that should only last for a million years or so.
D) The spiral arms will seem to wind up, to wrap more and more tightly around the center of the Galaxy.

guyanai · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

In a total solar eclipse, the faint corona is seen briefly. It is so hot that most of its energy is X-rays, not light, and it is much less dense than the photosphere.

Answer to Question 2

A