Comparison of sizes of objects with order of magnitude 1e15m: one light year radius circle with yellow Vernal Point arrow; Cat's Eye Nebula (NGC_6543) on left with Bok Globule Barnard 68 adjacent; Great January comet (Comet C/1910 A1)'s orbit shown as long extreme ellipse passing behind Barnard 68; light month shell (small yellow sphere) inside which a light week shell. All sizes to scale, but nebulae are artificially positioned for illustrative purposes only. No transparency version.
<a href="https://en.wikipedia.org/wiki/User:Paul_Stansifer" class="extiw" title="en:User:Paul Stansifer">Paul Stansifer</a>, <a href="//commons.wikimedia.org/wiki/User:84user" title="User:84user">User:84user</a>, ESA, NASA and ESO (and see "source")
2008-12-07
<p>created by running Paul Stansifer's GPL-2 POV-Ray source files modified by me, 84user, and using <a href="https://en.wikipedia.org/wiki/en:POV-Ray" class="extiw" title="w:en:POV-Ray">w:en:POV-Ray</a>, and <a href="https://en.wikipedia.org/wiki/en:IrfanView" class="extiw" title="w:en:IrfanView">w:en:IrfanView</a>.
</p><p>84user's contribution (inside POV-Ray files: adjusting coordinates, changing light source and other parameters) is public domain and source files used are described at <a href="//commons.wikimedia.org/wiki/User:84user/Size_comparison" title="User:84user/Size comparison">User:84user/Size comparison</a>.
</p><p>Cat's Eye Nebula and Stingray Nebula, see "Licensing" below.
</p><p>Physical information is based on the Wikipedia articles and elsewhere (see POVRay source files) about the respective lengths.
</p>
Paul Stansifer's contributions to this image (POV-Ray code) are available under the GPL, v. 2, and other licenses. See <a href="https://en.wikipedia.org/wiki/User:Paul_Stansifer/Size_comparison" class="extiw" title="en:User:Paul Stansifer/Size comparison">User:Paul Stansifer/Size comparison</a> for more details and the other licenses. See <a rel="nofollow" class="external autonumber" href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.html">[1]</a>