Explanation: 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. More information is given by the Space Telescope Scientific Institute's press release.

<<  Sentyabr'  >> Pn Vt Sr Cht Pt Sb Vs         1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30   1995   1996   1997   1998 1999   2000   2001   2002 2003   2004   2005   2006 2007   2008   2009   2010 2011   2012   2013   2014 2015   2016   2017   2018 2019   2020   2021   2022 2023   2024   2025

Yanvar' Fevral' Mart Aprel' Mai Iyun' Iyul' Avgust Sentyabr' Oktyabr' Noyabr' Dekabr'

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: star - zvezdy - termoyadernye reakcii Publikacii so slovami: star - zvezdy - termoyadernye reakcii
Sm. takzhe: Chernaya dyra razrushaet zvezdu: animaciya Zvezdy, pyl' i tumannost' v NGC 6559 25 samyh yarkih zvezd na nochnom nebe 2MASS J17554042+6551277 Animaciya: chernaya dyra razrushaet zvezdu Sravnenie razmerov zvezd Samaya dalekaya iz vseh izvestnyh zvezd? Vse publikacii na tu zhe temu >>