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The text, prompts and images of this site are licensed under the Creative Commons Attribution 4.0 International licence (CC BY 4.0). Full legal text: https://creativecommons.org/licenses/by/4.0/legalcode.

You may share and adapt the material for any purpose, provided you give appropriate credit. Each page ends with a “How to cite” box with the reference to use.

Code (scripts, filters, templates and code blocks in the pages) is licensed under the MIT licence: see LICENSE.

The background image images/hero-xdf.jpg is a NASA/ESA image in the public domain; see the README for the full credit.