IIAPY is the world's premier astrophotography competition, each year welcoming thousands of entries from astrophotographers across the globe.
2018 saw over 4,200 entries from 911 photographers, including 186 images from young photographers aged 15 and under.
Find out who won the overall prize this year - plus the winners of each category - in our gallery below.
The winning images are available to view in an exhibition at the National Maritime Museum from 24 October 2018 - 5 May 2019.
