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Author Question: What observations suggest the mass of the Galaxy goes much farther out than its visible disc? A) ... (Read 27 times)

schs14

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on: Jul 27, 2018
What observations suggest the mass of the Galaxy goes much farther out than its visible disc?
 
  A) the rotation curve of the outermost portions of the disc
  B) 21-cm maps of the spiral arms
  C) infrared observations of distant brown dwarfs
  D) the orbits of the open clusters in the disc
  E) X-ray images of other galaxies' discs from Chandra

Question 2

Why was the discovery of a substantial magnetic field around Mercury a surprise? How was it detected?
 
  What will be an ideal response?


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Danny Ewald

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

A

Answer to Question 2

In its close passes by Mercury, Mariner 10 found a field that is much stronger than Mercury's very slow rotation would have led us to expect with the dynamo theory.


schs14

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Reply #2 on: Jul 27, 2018
TY


Danny Ewald

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Reply #3 on: Jul 27, 2018
You're welcome


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