What observational technique allows astronomers to determine that Venus is rotating backwards?
A) Mapping rotational patterns in Venus' cloud formations.
B) Doppler shift of radio signals bounced off Venus' equatorial regions.
C) Doppler shift of radio signals bounced off Venus' polar regions.
D) Mapping heat signatures on Venus's surface at different latitudes.

Question

Quizplus · Accepted Answer

The Doppler shift of radio signals bounced off Venus' equatorial regions allows astronomers to measure the rotational speed and direction, revealing that Venus rotates in the opposite direction to most planets.

What Observational Technique Allows Astronomers to Determine That Venus Is