fiat lux is a Latin term meaning let there be light. The phrase is used in the Book of Genesis. The image is of galaxy NGC 2207 taken with the Hubble Space Telescope.
Source image is from GReat Images in NASA (GRIN) web site: http://grin.hq.nasa.gov/ABSTRACTS/GPN-2000-000897.html. It has been modified somewhat for this artwork.