A quick google and the Astronomy Photographer of the Year exhibition at the Royal Observatory was our chosen destination.
I thought it was absolutely brilliant. The photos are stunning, and I was particularly impressed by the Young Photographers category. The youngest runner up was only 10 but managed to take an amazing photo. I'd have no idea where to begin!
We also enjoyed the view over London and took advantage of free entry to the National Maritime Museum.
The exhibition is free and open until 23rd February 2014. Nearest stations: Cutty Sark (DLR) or Greenwich (National Rail from London Bridge, NOT North Greenwich on the Jubilee line)