Magnetosphere of Jupiter By 1973 the magnetic moment was known within a factor of two, whereas the tilt was correctly estimated at about 10°. The modulation of Jupiter's DAM by Io (the so-called Io-DAM) was discovered in 1964, and allowed Jupiter's rotation period to be precisely determined. The definitive discovery of the Jovian magnetic field occurred in December 1973, when the Pioneer 10 spacecraft flew near the planet. As of 2009 a total of eight spacecraft have flown around Jupiter and all have contributed to the present knowledge of the Jovian magnetosphere. The first space probe to reach Jupiter was Pioneer 10 in
Space probe Transport Network. First man-made object to soft land on the Moon, or any other extra terrestrial surface. First mission to photograph the far side of the Moon, launched in 1959. First robotic sample return probe from the Moon. First rover on Moon. It was sent to the Moon on November 10, 1970. First probe to Mercury. First successful in-place analysis of another planet. It may have also been the first space probe to impact the surface of another planet, although it is unclear whether it reached Venus' surface. The Venera 7 probe was the first spacecraft to successfully soft land