Science Essay "Black Holes"

Black Holes

I studied science in hight school about galaxy. I think so interested for my because there are a lot of thing for example stars Milky way galaxy dust dark matter. The name is from the Greek root galaxias [γαλαξίας], meaning "milky," a reference to the Milky way and another thing is Black hold. Last week, I saw video about Black Hold also.

A black hold is a theoretical region in which the gravitational field is so powerful that nothing, not even electromagnetic radiation, can escape its pull after having fallen past its event horizon.The term derives from the fact that the absorption of visible light renders the hole's interior invisible, and indistinguishable from the black space around it.

According to this mass/size criterion then, black holes are commonly classified as; Supermassive black holes, that contain hundreds of thousands to billions of solar masses are believed to exist in the center of most galaxies, including our own Milky Way. Intermediate-mass black holes, whose sizes are measured in thousands of solar masses, probably exist. They have been proposed as a possible power source for the ultra- luminous X ray sources. Stellar-mass black holes ave masses ranging from a lower limit of about 1.5–3.0 solar masses. Micro black holes have masses much less than that of a star. At these sizes, the effects of quantum mechanics are expected to come into play.

In my opinion, In the galaxy might be have other species or another universal stay somewhere ?

Sources : http://en.wikipedia.org/wiki/Black_hole

: http://en.wikipedia.org/wiki/Galaxy

: www.google.com/s2/sharing/stuff?user=108789611523271568497