Wednesday, 26 October 2016
Detectan inesperados halos gigantes alrededor de distantes cuásares
Detectan inesperados halos gigantes alrededor de distantes cuásares: Los cuásares, objetos más luminosos y activos del universo, son galaxias activas que contienen agujeros negros supermasivos en su interior, que consumen estrellas, gas y otros materiales a una alta velocidad y provocan la emisión de enormes cantidades de radiación
Monday, 10 October 2016
Thursday, 11 February 2016
Wednesday, 20 January 2016
Wednesday, 21 October 2015
Wednesday, 29 July 2015
Thursday, 17 July 2014
Friday, 30 November 2012
Texas Astronomers Measure Most Massive,
Most Unusual Black Hole Using Hobby-Eberly Telescope
28 November 2012
Fort Davis, Texas — Astronomers have used the Hobby-Eberly Telescope at The University of Texas at Austin's McDonald Observatory to measure the mass of what may be the most massive black hole yet — 17 billion Suns — in galaxy NGC 1277. The unusual black hole makes up 14 percent of its galaxy's mass, rather than the usual 0.1 percent. This galaxy and several more in the same study could change theories of how black holes and galaxies form and evolve. The work will appear in the journal Nature on Nov. 29. cont ........
http://mcdonaldobservatory.org/news/releases/2012/1128.html
Monday, 8 October 2012
Saturday, 30 June 2012
Tuesday, 31 January 2012
Friday, 21 October 2011
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Friday, 16 September 2011
Saturday, 14 May 2011
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Wednesday, 30 March 2011
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Wednesday, 26 January 2011
Black Hole:
A black hole is an astronomy theoretical celestial object, formed when a massive star collapses from its own gravity. A black hole has such a strong pull of gravity that not even light can escape from it.
Some scientists theorize that rotating black holes (also know as Kerr black holes) which contain billions of dead stars lie at the centers of galaxies.
The idea of black holes was first theorized in the late eighteenth century by English geologist John Mitchell and French astronomer Pierre Simon Laplace. At one time, scientists called them "gravitationally collapsed objects." Russian scientists suggested calling them "collapsars," but it wasn't until 1969 when Princeton physicist, John Wheeler coined the term black hole. Black holes have continued to hold public interest and are a popular fixture of science fiction books and movies.
Definition: black-hole dynamic laws:
Laws of black-hole dynamics -
First law of black hole dynamics: For interactions between black holes and normal matter, the conservation laws of mass-energy, electric charge, linear momentum, and angular momentum, hold. This is analogous to the first law of thermodynamics.
Second law of black hole dynamics: With black-hole interactions, or interactions between black holes and normal matter, the sum of the surface areas of all black holes involved can never decrease. This is analogous to the second law of thermodynamics, with the surface areas of the black holes being a measure of the entropy of the system.
Friday, 20 November 2009
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