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Author Question: Which of the following methods used to determine the mass of a cluster of galaxies does not depend ... (Read 70 times)

mynx

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on: Jul 27, 2018
Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?
 
  A) measuring the amount of distortion caused by a gravitational lens
  B) measuring the temperature of X-ray gas in the intracluster medium
  C) measuring the orbital velocities of galaxies in the cluster
  D) none of the above

Question 2

Cometary dust tails lag behind the bluish ion tails as the comet rounds the Sun.
 
  Indicate whether the statement is true or false


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ttt030911

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

A

Answer to Question 2

TRUE


mynx

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Reply 2 on: Jul 27, 2018
:D TYSM

xiazhe

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Reply 3 on: Yesterday
Excellent

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