Fil:Red Giant Plunging Through Space.jpg

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Beskrivelse
English: This image from the Spitzer Space Telescope (left panel) shows the "bow shock" of a dying star named R Hydrae (R Hya) in the constellation Hydra.

Bow shocks are formed where the stellar wind from a star are pushed into a bow shape (illustration, right panel) as the star plunges through the gas and dust between stars. Prior to this image one had never been observed around this particular class of red giant star. Our own Sun has no bow shock, only a bow wave.

R Hya moves through space at approximately 50 kilometers per second. As it does so, it discharges dust and gas into space. Because the star is relatively cool, that ejecta quickly assumes a solid state and collides with the interstellar medium. The resulting dusty nebula is invisible to the naked eye but can be detected using an infrared telescope.

This bow shock is 16,295 AU from the star to the apex and 6,188 AU thick. 1 AU is the distance between the Sun and the Earth. The mass of the bow shock is about 400 times the mass of the Earth.

The false-color Spitzer image shows infrared emissions at 70 microns. Brighter colors represent greater intensities of infrared light at that wavelength. The location of the star itself is drawn onto the picture in the black "unobserved" region in the center.
Dato
Kilde http://www.spitzer.caltech.edu/images/2183-sig06-029-Red-Giant-Plunging-Through-Space
Forfatter IR: NASA/JPL-Caltech/T. Ueta (U. of Denver); Artist Concept: NASA/JPL-Caltech/T. Pyle (SSC/Caltech)
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Image use policy: http://www.spitzer.caltech.edu/info/18-Image-Use-Policy

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Public domain Denne fil er i offentligt domæne i USA fordi den udelukkende er skabt af NASA. NASAs ophavsretspolitik erklærer at materiale udgivet af NASA ikke er omfattet af ophavsret medmindre andet er nævnt. (Se også Template:PD-USGov, NASAs ophavsretspolitik eller JPLs politik for brug af billeder.)
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nuværende15. jun. 2011, 00:26Miniature af versionen fra 15. jun. 2011, 00:263.000 × 2.400 (1,56 MB)Spitzersteph

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