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Author Question: What evidence did astronomers use to prove jets travel in opposite directions? a. spectral lines ... (Read 79 times)

vicky

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on: Jul 27, 2018
What evidence did astronomers use to prove jets travel in opposite directions?
 
  a. spectral lines from fast-moving red- and blue-shifted ionized gas
 b. gamma ray emission spectra
 c. magnetic tubes in accretion disks
 d. mass transfer from a binary star to a compact companion
 e. pulsar rotation periods

Question 2

Ancient astronomers often had difficulty explaining _____, the occasional westward motion of the planets.
 
  a. parallax
 b. eccentrics
 c. retrograde motion
  d. deferents
 e. epicycles


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Sammyo

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

a

Answer to Question 2

c


vicky

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Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

bitingbit

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

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