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Author Question: How can the image of a single quasar be doubled? What does that tell us about the quasar's distance? ... (Read 118 times)

oliviahorn72

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on: Jul 27, 2018
How can the image of a single quasar be doubled? What does that tell us about the quasar's distance?
 
  What will be an ideal response?

Question 2

One of the effects of Mercury's very slow spin is
 
  A) tectonic activity.
  B) large variations in the size of its polar cap.
  C) an intensely powerful magnetic field.
  D) wind patterns that are slow, but global in size.
  E) extreme variations in its surface temperature.


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vickyvicksss

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

If the gravity of a massive foreground galaxy bends the quasar's light, it can create multiple images. The quasar must be behind and at a much great distance from us than the lensing galaxy.

Answer to Question 2

E


oliviahorn72

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Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


vickyvicksss

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Reply #3 on: Jul 27, 2018
Great! Please up vote :D


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