Soubor:Gliese 105.gif

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Gliese_105.gif ‎(502 × 284 pixelů, velikost souboru: 54 KB, MIME typ: image/gif)

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PopisGliese 105.gif	English: Is the dim star to the upper right of this false-color picture the coolest possible normal star? From this recent picture by the Hubble Space Telescope, astronomers have estimated its mass is just high enough for it to fuse hydrogen into helium in its core. In general, the higher an object's mass, the higher it's core density and temperature. Above a certain point, the intense core conditions cause hydrogen atoms to move so fast that many stick or "fuse" after collision, releasing enormous amounts of energy. Were this object less massive, the object would shine by gravitational contraction and so be termed a "brown dwarf" rather than a normal main-sequence "star." The star on the left is so much brighter than the "coolest star" that it creates the white streak and dramatic pattern visible in the image.
Datum	20. září 1995
Zdroj	https://apod.nasa.gov/apod/ap950920.html
Autor	NASA, HST, WFPC 2, D. Golimowski (JHU)
Další verze	jpg version (a bit different)

	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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	Datum a čas	Náhled	Rozměry	Uživatel	Komentář
současná	22. 5. 2008, 15:28		502 × 284 (54 KB)	Fran Ara	{{Information \|Description= Gliese 105 \|Source=http://apod.nasa.gov/apod/ap950920.html \|Date= \|Author=NASA \|Permission=see below \|other_versions= }}

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