Q.

Pick up the correct statement from the following:

A. the first man-made satellite, sputnik-l\ was launched on 4th october, 1957
B. the united state\s explorer 6 transmitted the first picture of the earth in august 1959
C. television infrared observation satellite (tiros) designed for meteorological observations, started systematic earth observations from space from 1, april, 1960
D. all of these
Answer» D. all of these
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