The unprecedented observations of comet 41P/Tuttle–Giacobini–Kresák show its rotation slowing, reversing and then speeding up, and jet-like outbursts of gas might be providing the push.

Hitting the brakes: Hubble Space Telescope watches doomed comet reverse its spin

Source: space
Source Link: https://www.space.com/astronomy/comets/hitting-the-brakes-hubble-space-telescope-watches-doomed-comet-reverse-its-spin