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Author Question: How is proper motion measured? What will be an ideal response? ... (Read 14 times)

123654777

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on: Jul 27, 2018
How is proper motion measured?
 
  What will be an ideal response?

Question 2

Any main sequence star over 25 solar masses will probably retain enough matter in its core after its type II supernova to make a black hole.
 
  Indicate whether the statement is true or false


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Tonyam972

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

It is the apparent motion of the star, in seconds of arc, over an interval of exactly one year, after the Earth returns to the same place in its orbit, and all parallax is negated.

Answer to Question 2

TRUE


123654777

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Reply 2 on: Jul 27, 2018
:D TYSM

jackie

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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