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
The Jupiter Theft and then "speak" the Cygnan musical language, and is educated by Cygnan didactic films. They discover the Cygnans have travelled for 6000 light years - and six million earth years - escaping a home planet orbiting the progenitor star of Cygnus X-1, having discovered it was on course to collapse (forming the black hole that now occupies that point in space), searching for a new home; and, to do so, have raided numerous star systems for Jupiter-mass "gas giant" planets to use as fuel. The stop-off at Sol proves to be a particularly significant one as, having found every system