File:NASA-KeplerSecondLight-K2-Explained-20131211-fr.png

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Description	Français : Sur son orbite héliocentrique, le télescope spatial Kepler est soumis principalement à la pression de rayonnement c'est-à-dire la poussée exercée par les photons. A la suite de la panne des roues de réaction, Kepler ne pouvant plus maintenir son orientation que dans deux dimensions, les ingénieurs ont imaginé d'utiliser cette poussée des photons pour maintenir le pointage du télescope spatial. Pour subir une poussée symétrique de la part de ces particules tout en maintenant le télescope pointé vers une portion du ciel fixe, l'axe du télescope est positionné de manière à être parallèle à son plan orbital. Pour que le Soleil ne pénètre pas dans l'ouverture du télescope, son orientation est modifiée tous les 83,5 jours ce qui impose à chaque fois un changement de la région de l'espace étudiée.
Date	24 November 2013
Source	http://www.nasa.gov/sites/default/files/k2_explained_25nov_story.jpg
Author	NASA

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	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

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Software used	Adobe Photoshop CS5.1 Macintosh
Date and time of digitizing	23:46, 24 November 2013
Date metadata was last modified	11:38, 1 November 2018
File change date and time	11:38, 1 November 2018
Unique ID of original document	xmp.did:FA7F117407206811871F8312419CC8B8

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