File:1e16m comparison ten light years bubble nebula.png

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• Barnard 68 image from http://www.eso.org/gallery/v/ESOPIA/Stars/phot-02a-01.tif.html:

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• Public domain Cat's Eye Nebula images license:

This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use. The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org. For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag.

• Cat's Eye Nebula image credit: NASA, ESA, HEIC, and The Hubble Heritage Team (STScI/AURA) from [1].
• Bubble Nebula (NGC 7635) taken by Robert J. Vanderbei (http://www.princeton.edu/~rvdb/images/NJP/ngc7635.html):

Vanderbei at en.wikipedia, the copyright holder of this work, hereby publishes it under the following licenses:

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	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
	Attribution: Vanderbei at en.wikipedia
	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
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Attribution: Vanderbei at en.wikipedia

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• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.

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