Licensing
Using the images
Every photograph published on this site is licensed under Creative Commons Attribution 4.0 International (CC BY 4.0).
The credit line
Use this wherever the image appears:
Chris / astrochris.net — CC BY 4.0
Online, please make astrochris.net a link to
https://astrochris.net/ or to the page the image came from.
In print, the plain text above is enough.
What you may do
- Share the image anywhere, in any medium or format.
- Crop it, adapt it, re-process it, build on it.
- Use it commercially — in a magazine, a book, a product, a talk, a video.
The one condition
Give appropriate credit, using the line above, and indicate whether you changed the image. That is the whole of the obligation. You do not need to ask permission first, and you do not need to pay anything.
You may not add legal terms or technical measures that stop anyone else from doing what the licence allows.
Practical notes
- Which images this covers
- Every photograph published on this site, unless a caption on that specific image says otherwise.
- What it does not cover
- The site design, the written text of posts and object pages, and the site name and mark. Catalogue data shown on object pages comes from OpenNGC and carries its own CC-BY-SA-4.0 terms.
- Full-resolution files
- The versions on this site are resized for the web. If you need the full-resolution master — for print, for a publication, or for a Wikimedia Commons upload — ask and it will be sent.
- Wikipedia and Wikimedia Commons
- CC BY 4.0 is compatible with Wikimedia Commons. Uploads are welcome; please keep the credit line intact and link back to the source page.
- A different licence
- If attribution genuinely does not work for your use, get in touch and a separate arrangement can usually be made.
Enquiries
Email hello@astrochris.net with the page the image is on and where you intend to use it.