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Home Q & A Board Science-Related Homework Help Physics
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Tsync Tsync
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8 years ago
To measure how Mercury spins, astronomers sent ________ to Mercury and used the Doppler shift to determine how fast it was rotating.
A) radar beams
B) probes
C) laser beams
D) a satellite
E) a single frequency radio signal
Textbook 
Astronomy Today

Astronomy Today


Edition: 8th
Authors:
Read 241 times
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Minoring in physics
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RatatouilleRatatouille
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8 years ago
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Tsync Author
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#2
8 years ago
Wonderful, thanks for your time and effort
Minoring in physics
wrote...
#3
8 years ago
Slight Smile
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