Image: 1e15m comparison cat's eye nebula barnard 68 one light year

Description: 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.
Title: 1e15m comparison cat's eye nebula barnard 68 one light year
Credit: created by running Paul Stansifer's GPL-2 POV-Ray source files modified by me, 84user, and using w:en:POV-Ray, and w:en:IrfanView. 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 User:84user/Size comparison. Cat's Eye Nebula and Stingray Nebula, see "Licensing" below. Physical information is based on the Wikipedia articles and elsewhere (see POVRay source files) about the respective lengths. Paul Stansifer's contributions to this image (POV-Ray code) are available under the GPL, v. 2, and other licenses. See User:Paul Stansifer/Size comparison for more details and the other licenses. See [1]
Author: Paul Stansifer, User:84user, ESA, NASA and ESO (and see "source")
Usage Terms: Public domain
License: Public domain
Attribution Required?: No