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Summary: 7 MARCH 2003 VOL 299 SCIENCE www.sciencemag.org1530
providing the first-ever conjunction of two
spacecraft at an outer planet. Nearly simulta-
neous measurements were also made by the
Hubble Space Telescope and the Chandra X-
ray Observatory from Earth orbit. Because
Galileo's high-gain antenna failed to open, the
spacecraft has very limited communication to
Earth and cannot provide the larger picture of
Jupiter meteorology. Cassini scientists and en-
gineers took this opportunity to take simulta-
neous measurements with the Galileo space-
craft, to provide a long continuous look at the
Jupiter system, and to test their experiments in
preparation for the 4-year tour of the Saturn
system. The first Cassini imaging results are
presented by Porco et al. in this issue (1).
Cassini measurements of the Jupiter radiation
environment, which complement the imaging
results reported here, have been published
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