File:Gliese 105.gif
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Gliese_105.gif (502 × 284 pixels, file size: 54 KB, MIME type: image/gif)
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DescriptionGliese 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. |
Date | |
Source | https://apod.nasa.gov/apod/ap950920.html |
Author | NASA, HST, WFPC 2, D. Golimowski (JHU) |
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Public domainPublic domainfalsefalse |
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.) | ||
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:28, 22 May 2008 | 502 × 284 (54 KB) | Fran Ara (talk | contribs) | {{Information |Description= Gliese 105 |Source=http://apod.nasa.gov/apod/ap950920.html |Date= |Author=NASA |Permission=see below |other_versions= }} |
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