This is somewhat off-topic; but you'll recall that it was Jupiter that allowed Olaus Roemer to first measure the speed of light, by noting the changes in the apparent eclipse times of Jupiter's moons at various points in the planet's solar orbit. Now the giant planet may be about to come through for us again by allowing the first measurement of the speed of gravitational fields (and Einstein's prediction that it's the same as lightspeed): http://www.spaceref.com/news/viewpr.html?pid=9178
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