Joint Chinese/European mission ready for launch   Double Star's satellite pair study space weather around the Earth. One satellite circles the Earth's Equator, the other flies over the poles.   This mission consists of two satellites, the equatorial satellite DSP-E (Tan Ce 1), following a 550 x 60 000 kilometre orbit, inclined at 28.5 degrees to the Equator and the polar satellite DSP-P (Tan Ce 2) following a 350 x 25 000 kilometre orbit inclined at 90 degrees to the Equator.   Artist's impression of Cluster.   Release date: 23 December 2003