Pioneer 4
The Pioneer 4 mission which was launched on March 3rd 1959 was the second of two early attempts
by the United States to send a spacecraft to the moon. The probe was primarily designed to
photograph the Moon. Pioneer 4 did in fact fly past the moon, but at a
much farther distance than planned, because of the trajectory error, the camera
sensor failed to trigger.
Pioneer 4 then went into orbit around the Sun becoming the
first spacecraft to do so, contact was lost on March 6, 1959.
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