File:Doppler Shift of a Star’s Spectrum (01F8GFCAM7Q0EMKZ3QFAF9AQJ3).png
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| Description |
English: As a planet orbits a star, the star wobbles. This causes a change in the appearance of the star’s spectrum called Doppler shift. While the star is moving toward us, its spectrum is blueshifted (top spectrum): All of the wavelengths look compressed and absorption lines appear at shorter (bluer) wavelengths than when the star is not moving toward or away from us (middle spectrum). While the star is moving away from us, the light is redshifted: All of the wavelengths look stretched out and the absorption lines appear at longer (redder) wavelengths (bottom spectrum). Because the change in wavelength is directly related to relative speed, astronomers can use Doppler shift to calculate exactly how fast an object is moving toward or away from us. Astronomers can also track the Doppler shift of a star over time to estimate the mass of the planet orbiting it. |
| Date | 2 July 2021, 19:15:00 (upload date) |
| Source | Doppler Shift of a Star’s Spectrum |
| Author | ILLUSTRATION: NASA, ESA, Leah Hustak (STScI) |
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This file is in the public domain because it was created by NASA, ESA and CSA. NASA Webb material 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/CSA is credited as the source of the material. This license does not apply if source material from other organizations is in use. The material was created for NASA by Space Telescope Science Institute under Contract NAS5-03127. Copyright statement at webbtelescope.org. For material created by the European Space Agency on the esawebb.org site, use the {{ESA-Webb}} tag. |
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| current | 13:06, 18 February 2023 | | 1,801 × 587 (242 KB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://stsci-opo.org/STScI-01F8QPCFSQCCNRDW2VBTJF3QHM.png via Commons:Spacemedia |
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