Last chance to see: Astronomy Photographer of the Year exhibition 2011 has been extended to 26 February.

We’ll be displaying the winners of the 2012 competition at the Royal Observatory from 21 September 2012. Find out more about this year’s competition, including how to enter, or take a look at some of our winners from previous years:

• 2011 winners
• 2010 winners
• 2009 winners

The Royal Observatory Astronomers have a look through photos in the Flickr group using the exhibition interactive

If you’d like a little memento of Astronomy Photographer of the Year 2011, why not have a look at our selection of postcards, posters and greeting cards. All are available to buy at our online shop and at the Royal Observatory, Greenwich.