The quiz above includes images taken by and belonging to Nicholas Martin (thanks Nick!), plus the following images:
- - Black Eye Galaxy (M64) - Image credit: NASA
- - Centaurus A (NGC 5128) - Image credit: NASA
- - Cigar galaxy (M82) - Image credit: NASA
- - ESO 350-40 - Cartwheel galaxy (PGC 2248) - Image credit: ESA/Hubble & NASA
- - NGC 1300 – Image credit: Hubble & NASA
- - NGC 1512 - Image credit: NASA/Space Telescope Science Institute - [1] - [2]
- - NGC 4038/NGC 4039 - Image credit: NAA
- - Spindle galaxy (M102) - Image credit: ESA/Hubble & NASA
- - Sombrero Galaxy (M104) - Image credit: NASA
- - Tadpole galaxy (PGC 57129) - Image credit: NASA [1] - [2]