The Gallery holds the most extensive collection of portraits in the world. Search over 215,000 works, 150,000 of which are illustrated from the 16th Century to the present day.

Reaching for the stars: Astronomers in focus

25 years ago, in April 1990, the Hubble Telescope was launched into space and has since been sending hundreds of thousands of images back to earth. This slideshow celebrates the achievements of astronomy by looking at the men and women behind the telescopes. The portraits were taken between 1848 and 2009 and are part of the Photographs Collection.