De_Sitter_argument_against_emission_theory.gif (405 × 110 pixels, file size: 127 KB, MIME type: image/gif, looped, 120 frames, 9.6 s)
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Summary
| Description |
English: Author: User:Stigmatella aurantiaca |
| Date | 20 July 2012 (original upload date) |
| Source | Own work |
| Author | User:Stigmatella aurantiaca |
Source: Own work. Bitmap images generated by a computer program and exported to GIF files, assembled into an animation using GIMP.
Description: According to simple emission theory, light thrown off by an object should move at a speed of c with respect to the emitting object. Willem de Sitter argued that if this were true, a star in a double-star system would usually have an orbit that caused it to have alternating approach and recession velocities, and light emitted from different parts of the orbital path would then travel towards us at different speeds. For certain combinations of orbital speed, distance, and inclination, the "fast" light given off during approach would be able to catch up with and even overtake "slow" light emitted earlier during a recessional part of the star's orbit. A multiplicity of bizarre effects would be seen, including (a) unusually shaped variable star light curves such as have never been seen, (b) extreme Doppler red- and blue-shifts in phase with the light curves, implying highly non-Keplerian orbits, and (c) splitting of the spectral lines (note simultaneous arrival of blue- and red-shifted light at the target).
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
Original upload log
Transferred from en.wikipedia to Commons using For the Common Good.
| Date/Time | Dimensions | User | Comment |
|---|---|---|---|
| 19:47, 13 May 2013 | 405 × 110 (130,166 bytes) | w:en:Stigmatella aurantiaca (talk | contribs) | Replaced dots with lines to represent variable wavelength. Switched to black background so that color shows up better. |
| 11:07, 13 May 2013 | 405 × 110 (152,290 bytes) | w:en:Stigmatella aurantiaca (talk | contribs) | Color-coding Doppler shifts |
| 23:50, 22 July 2012 | 405 × 110 (114,320 bytes) | w:en:Stigmatella aurantiaca (talk | contribs) | much improved numerical integration |
| 21:23, 21 July 2012 | 405 × 110 (116,837 bytes) | w:en:Stigmatella aurantiaca (talk | contribs) | Further improvements to numerical integration |
| 12:14, 21 July 2012 | 405 × 110 (117,081 bytes) | w:en:Stigmatella aurantiaca (talk | contribs) | Improved numerical integration |
| 04:20, 20 July 2012 | 405 × 110 (115,230 bytes) | w:en:Stigmatella aurantiaca (talk | contribs) | Author: [[User:Stigmatella aurantiaca]] Source: Own work. Bitmap images generated by a computer program and exported to GIF files, assembled into an animation using GIMP. Description: According to simple emission theory, light thrown off by an object... |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:47, 14 December 2013 | | 405 × 110 (127 KB) | Stigmatella aurantiaca | Transferred from en.wikipedia: see original upload log above |
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