: : I am a young cuban professor of Fisics of secundary scholl, I am very interested in blackholes. Actually I work in a actualization of the Fisics course and I incorporate a blackholes problems in my course.

: : Please, I need more information about Blackholes. : : I am very interested in this topic and in any new methods in a Fisic's Didactics. : : Thank you very much in advance and Sorry for my bad English. : : Nuria Torres Barreto : : Address: : : A.P. 678, C.P. 11300 : : Habana 13 : : Cuba : : e-mail: biokarst@cidea.unepnet.inf.cu

: Blackholes are fairly easy to understand. They consist of the remains of old blue and red giants - certain stars consisting of large quantities of matter. The formation of a blackhole occurs when one of these giant stars undergoes a supernova. Once the supernova occurs, most of the excess matter collapses on itself because of the intense gravitational force. If a star is big enough, its gravitational force is so intense that it captures light and the object(if we can call it that) emits X-rays. We obviously need light to see something, so how can we see a blackhole? Well, through a spectrometer, if we see spikes of x-ray light being emitted from a source, that will tell us if a blackhole resides in that spot. The first observed blackhole is called, "Cygnus X-1."

I have a problem with the X-ray thing. Black holes do not, as fas as I know. Emit X-ray radiation. But it's true that the gases, going into a black hole emit X-rays. Usually the gases are from a star circleing the black hole.

Just other info: Black holes are black because you have to be going faster then light speed to leave them. That means that even light doesn't escape it.