The Cosmic Microwave Background Was Discovered By

The cosmic microwave background was discovered by:

A) rocket-borne telescopes that also discovered X-ray sources in space.
B) the Voyager 2 spacecraft during one of its "coasting" periods between planetary encounters.
C) scientists testing a new antenna and receiver for satellite communications.
D) the IRAS satellite, which produced an all-sky infrared survey.

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