(instrument on 1980s Soviet satellite to view the CMB)
RELIKT-1 was an instrument (or experiment) on the USSR satellite,
Prognoz 9, launched in 1983. The instrument's purpose was to map
radio within the frequency-range of the CMB. It
mapped the sky at 37 GHz with an angular resolution of 5.5
degrees, and resulted in the announcement of CMB anisotropies.
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