An excellent photo showing comet Siding Spring and Mars in the same image, with the close flyby location marked with red arrows. Many thanks and well done to Rob Kaufman, Victoria, Australia.

Comet C/2013 A1 Siding Spring and Mars, 11 Oct 2014. Credit: Rob Kaufman

Comet C/2013 A1 Siding Spring and Mars, 11 Oct 2014. Credit: Rob Kaufman

This image shared via the Facebook page of the Coordinated Investigations Of Comets (CIOC) Siding Spring group – thanks guys!