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NASA's $3.3-billion Cassini spacecraft streaked past a tiny outer moon of Saturn on Friday afternoon, cruising toward a crucial June 30 rendezvous with the majestic ringed planet. Cassini zipped past the icy, enigmatic moon Phoebe at a distance of about 1,240 miles at 2:56 p.m. MDT.
I read about this moon being a possible comet or meteor in another article and I was just wondering why does our little spaceship need to retrofire its rockets to slow down and be captured by the planet's gravitational pull and the passing asteroid(Phoebe) just becomes a captured "moon" w/out slowing down its trip across our galaxy? Jim Davis- Thank you.