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Author Question: To measure how Mercury spins, astronomers sent ________ to Mercury and used the Doppler shift to ... (Read 79 times)

DelorasTo

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on: Jul 27, 2018
To measure how Mercury spins, astronomers sent ________ to Mercury and used the Doppler shift to determine how fast it was rotating.
 
  A) probes
  B) laser beams
  C) radar beams
  D) a satellite
  E) a single frequency radio signal

Question 2

The place in a planet's orbit that is closest to the Sun is called:
 
  A) vernal equinox.
  B) aphelion.
  C) perihelion.
  D) crossing the ecliptic.
  E) None of these; a planet's distance from the Sun never changes.


AISCAMPING

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

C

Answer to Question 2

C


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