Image:Lightcone.png

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I drew this in Inkscape based on a diagram from A Brief History of Time. Given that it is such a simple diagram, and that I've redrawn it, I don't think it violates Stephen Hawking's copyright. Therefore I'm releasing it into the public domain.

This file has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. This applies worldwide.

This license tag is deprecated! Please use one of the following instead: {{PD-old}} (for works out of copyright where the author has been dead for over 100 years), {{PD-art}} (for photos of old paintings), {{PD-ineligible}} (for trivial work), {{PD-USGov}} (for work by the U.S. government), {{PD-US}} (for work that is public domain for the U.S. only), {{PD-self}} (if the uploader releases the rights), {{PD-user|user}} (if another user released his/her rights). If the work is PD for another reason, check the copyright tag page or use {{PD-because|reason}}. If this work was uploaded with this template after 1 June 2008, it should be tagged with {{subst:nld}}. If the copyright status of this work cannot be confirmed as free, and usage does not meet requirements of the non-free content policy, it should be tagged as possibly unfree or listed for deletion.

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