[MineralMan]

OK, Nathan. If you are going to quote long passages from web sites, please reference the web site. It is obvious that you did not write the post yourself, so you need to tell us where you got this text. To do otherwise is to plagiarize.

So, which web site did you copy and paste that from?

[RadioAstronomer]

See my post 83. :-)

[general_re]

It's classic Hovindia, or more precisely, one of Dr. Dino's stable of authors:

http://www.drdino.com/articles.php?spec=79