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 Amoeba Space Amoeba , is a 1970 Japanese science fiction kaiju film directed by Ishirō Honda, and featuring special effects by Sadamasa Arikawa. The film tells the story of extraterrestrial amoeba-like aliens that hijack a probe and, after crash landing on a small South Pacific atoll, create gigantic monsters from native lifeforms (a kisslip cuttlefish, stone crab and mata mata) with plans of conquering the Earth. The film was released theatrically in the United States in 1971 by American International Pictures as "Yog-Monster From Space". The "Helios 7" space probe is sent on a mission to study the planet Jupiter. While