In a first, scientists observe a comet reversing its spin: "Like pushing a merry-go-round" CBS News NASA spots comet reversing its spin in a first for science Scientific American NASA’s Hubble Detects First-Ever Spin Reversal of Tiny Comet NASA Science (.gov) Hitting the brakes: Hubble Space Telescope watches doomed comet reverse its spin Space Hubble Spots Comet’s Mysterious Spin Behavior Yahoo