The content on this website is available under the following terms:
I am a Photo Ambassador for the European Southern Observatory, and many of my astro photos are available in ESO’s galleries. These photos are available under the Creative Commons by license, and you can find them all in ESO’s galleries.
I sell some of my photos via 500px – you can find these here. I’m working on increasing the number of photos available there!
Anything not covered by the first two categories is released under the Creative Commons by-nc-sa license. This means you can freely use any of it for any non-commercial use, as long as you properly credit me, and license any derivative works under the same conditions. If you want to commercially use any of this content, please send an email to roger at world-traveller dot org. My normal fee for a single use image license is 10 GBP or 15 USD.