Astronomy Question?

Read here:

http://www.geocities.com/autotheist/Physics/bh.htm

and here:

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

It is now believed that many galaxies have supermassive black holes at their centers, and that whether such galaxies are active galaxies is a question of whether mass is being fed into these black holes. The simplest ideas for the origin of such supermassive black holes are that they are conglomerations of many star-size black holes that were formed during the history of a galaxy, or perhaps that galaxies formed around large black holes that then grew by accreting matter.

The black hole are in the middle of our galaxy and all the galaxies as it furnishes the gravity well that might be 100 light years across. This holds all the solar systems in an orbit around it.

There are two books you may find helpful:

"Black Holes and Baby Universes" by Stephen Hawking

"Death by Black Hole" by Neil deGrasse Tyson

Tyson has appeared on a couple of television shows. I like how he explains things.

I did a project in 8th grade on black holes and I used "Collapsing Universe" by Issac Asimov. Check it out at a library.

Here's more information than yu can probably use ...

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

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

Google it, wikipedia it