clipped from: www.badastronomy.com 
I am an astronomer, writer, and skeptic. I like reality the way it is, and I aims to keep it that way. My real name is Phil Plait, and I run the Bad Astronomy website.
Creationists who bang the pulpit about the Universe being young tend to use old, outdated, and long-debunked arguments.
The astronomy ones just crack me up. Sometimes they are based on faulty data, sometimes on twisting or misinterpreting the results, sometimes on outright lies. They are most pernicious, perhaps, when there is a kernel of truth in what they say… though generally they leave out a HUGE amount of information that shows they are wrong.
One argument has to do with angular momentum. This is a tendency for a rotating object to stay spinning unless acted upon by a force of some kind (that "acted upon" part is important later). Mathematically, it depends on how big an object is and how fast it spins.