The Astronomy Photographer of the Year competition, run by the Royal Observatory Greenwich in association with BBC Sky at Night Magazine, is now in its sixth year and has received a record number of over 2,500 entries from amateur and professional photographers from around the globe.

The winners of the competition's four categories and three special prizes will be announced on 17 September and an exhibition of the winning images opens the following day at the Royal Observatory.

IBTimesUK presents a gallery of the images shortlisted for this year's Astronomy Photographer of the Year. See more at the dedicated Flickr group.