The Astronomy Photographer Of The Year 2013 exhibition kicked off at the Royal Observatory Greenwich last week, and best of all, it's free to visit.

The overall winner was Australian Mark Gee with his 'Guiding Light to the Stars' image – you can find his photograph in the gallery above.

See above for a gallery of some of the winning and highly commended images.

For information on entering next year's competition, see rmg.co.uk/astrophoto