Two Tails

This close-up of the nucleus shows the two tails clearly. The gas tail is the bright jet moving upwards. This points directly away from the sun and is caused by the solar wind. The fainter dust tail is the one pointing at 45 degrees to the gas tail. This shows the trajectory of the comet.

The elongation of the nucleus and the background stars is caused by the earths rotation during the 15 second exposure.