Radio astronomy has played a pivotal role in showing us the detailed structure of the Milky Way Galaxy. Which of the following techniques would a radio astronomer use as an essential part of an investigation of this structure?
A) measuring the Doppler shift of a line in a radio spectrum
B) taking a photograph of the sky in the direction of the Big Dipper
C) using a CCD and a filter to record the amount of light from the stars in a nearby open cluster
D) measuring the amount of synchrotron radiation from the Crab Nebula
E) measuring the amount of radio radiation coming from the direction of Jupiter and other planets in the solar system
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