Difference between revisions of "Research page:Black holes"

Revision as of 07:42, 6 June 2012

A black hole is an infinitely dense region that contains the mass of

millions or billions of Suns and from which no light can escape

Probably each elliptical galaxy, the largest in the cosmos, contains a supermassive black hole when about 3.5 billion years old - these are called high-energy quasars

The biggest black hole discovered as of 2009 weighs 18 billion suns and is about the size of an entire galaxy

The event horizon is the sphere around a black hole within which nothing can escape because all light and info is pulled in and because nothing can go quicker than the speed of light, the event horizon can also be seen as the edge of the universe. The universe looks like a kind of Swiss cheese.

'The properties of time and space are reversed'

Celestial bodies can orbit around a black hole as long as they are outside the event horizon. The mass is still there.

The heaviest black hole observed in 2008 was 3 billion x sun mass, which is about the mass of an ordinary galaxy = supermassive black holes

An ordinary black hole has about the mass of 10 suns

Light cannot escape a black hole because it loses energy trying to escape, just like light that moves away from a heavy object loses energy because it red-shifts to lower frequencies of life.

It isn't clear where the super-massive black holes at the centers of galaxies came from. They have a mass of billions of suns. It may be that at the beginning of the cosmos there existed super-massive stars whose collapse caused the super-massive black holes.

Black holes don't have a surface but neutron stars do. This means that all gas that approaches a black hole gets sucked in and doesn't radiate light while neutron stars emit light when this happens.

External links

Black hole Research topics (John Eagles blog)

News articles

Newest at top

A Supermassive Black Hole Was Ejected Out Of Its Home Galaxy "One of the most fascinating – and potentially terrifying – things about this discovery is that it implies that there may be supermassive black holes moving through the universe outside of galaxies. And we currently have no way of knowing that they’re there." - Forbes - June 5, 2012
New Model May Show How Black Holes Become Supermassive "Almost every galaxy has an enormously massive black hole in its centre. Our own galaxy, the Milky Way, has one about four million times heavier than the sun. But some galaxies have black holes a thousand times heavier still. We know they grew very quickly after the Big Bang. These hugely massive black holes were already full-grown when the universe was very young, less than a tenth of its present age." - Forbes - March 26, 2012
The Smallest Known Black Hole Has 20 Million Mile Per Hour Winds - Forbes - Febr. 22, 2012

@@ Line 1: / Line 1: @@
-A black hole is an infinitely dense region that contains the mass of 	millions or billions of Suns and from which no light can escape
+A black hole is an infinitely dense region that contains the mass of
-Probably each elliptical galaxy, the largest in the cosmos, contains a 	supermassive black hole when about 3.5 billion years old - these are called 	high-energy quasars
+    millions or billions of Suns and from which no light can escape</li>
-The biggest black hole discovered as of 2009 weighs 18 billion suns and 	is about the size of an entire galaxy
+    <li>Probably each elliptical galaxy, the largest in the cosmos, contains a
-The event horizon is the sphere around a black hole within which nothing 	can escape because all light and info is pulled in and because nothing can 	go quicker than the speed of light, the event horizon can also be seen as 	the edge of the universe. The universe looks like a kind of Swiss cheese.
+    supermassive black hole when about 3.5 billion years old - these are called
-'The properties of time and space are reversed'
+    high-energy quasars</li>
-Celestial bodies can orbit around a black hole as long as they are 	outside the event horizon. The mass is still there.
+    <li>The biggest black hole discovered as of 2009 weighs 18 billion suns and
-The heaviest black hole observed in 2008 was 3 billion x sun mass, which 	is about the mass of an ordinary galaxy = supermassive black holes
+    is about the size of an entire galaxy</li>
-An ordinary black hole has about the mass of 10 suns
+    <li>The event horizon is the sphere around a black hole within which nothing
-Light cannot escape a black hole because it loses energy trying to 	escape, just like light that moves away from a heavy object loses energy 	because it red-shifts to lower frequencies of life.
+    can escape because all light and info is pulled in and because nothing can
-It isn't clear where the super-massive black holes at the centers of 	galaxies came from. They have a mass of billions of suns. It may be that at 	the beginning of the cosmos there existed super-massive stars whose collapse 	caused the super-massive black holes.
+    go quicker than the speed of light, the event horizon can also be seen as
-Black holes don't have a surface but neutron stars do. This means that 	all gas that approaches a black hole gets sucked in and doesn't radiate 	light while neutron stars emit light when this happens.
+    the edge of the universe. The universe looks like a kind of Swiss cheese.</li>
+    <li>'The properties of time and space are reversed'</li>
+    <li>Celestial bodies can orbit around a black hole as long as they are
+    outside the event horizon. The mass is still there. </li>
+    <li>The heaviest black hole observed in 2008 was 3 billion x sun mass, which
+    is about the mass of an ordinary galaxy = supermassive black holes</li>
+    <li>An ordinary black hole has about the mass of 10 suns</li>
+    <li>Light cannot escape a black hole because it loses energy trying to
+    escape, just like light that moves away from a heavy object loses energy
+    because it red-shifts to lower frequencies of life. </li>
+    <li>It isn't clear where the super-massive black holes at the centers of
+    galaxies came from. They have a mass of billions of suns. It may be that at
+    the beginning of the cosmos there existed super-massive stars whose collapse
+    caused the super-massive black holes. </li>
+    <li>Black holes don't have a surface but neutron stars do. This means that
+    all gas that approaches a black hole gets sucked in and doesn't radiate
+    light while neutron stars emit light when this happens.
 == External links ==