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Author Question: Which characteristic is not generally true of a starburst galaxy? A) The observed features that ... (Read 20 times)

cookcarl

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on: Jul 27, 2018
Which characteristic is not generally true of a starburst galaxy?
 
  A) The observed features that cause us to classify it as a starburst must be only temporary phenomena in the galaxy's history.
  B) The observed features of the starburst are thought to be caused by the presence of a supermassive black hole in the galaxy's center.
  C) Supernovae occur so frequently that their effects combine to drive a galactic wind that blows material into intergalactic space.
  D) Its rate of star formation is many times higher than the rate of star formation in the Milky Way.

Question 2

The apparent magnitude of the Sun is -26, while Sirius has an apparent magnitude of -1. How much brighter does the Sun appear than Sirius?
 
  What will be an ideal response?


nathang24

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

B

Answer to Question 2

This is a difference of 25 magnitudes. As each 5 magnitudes is a brightness factor of 100 times, then 100 to the fifth power is 10 billion times brighter.


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