Well my take on astro physics Archie is that it is the branch of astronomy that deals with the physicds of the universe, including the physical properties of celestial objects such as stars, galaxies, and the interstellar medium, as well as their interactions. The study of cosmology is theoretical astrophysics at scales much larger than the size of particular gravitationally-bound objects in the universe.
Chris, your answer, while intelligent, is actually quite narrow. The people at CERN and the shiny new Large Hadron Collider (I'm so happy with that thing, I could actually wet myself by thinking about it) are also looking at the astro physics of our (and other) universe(s). You see, when scientists try to calculate and mathmatize their way back to the moment right after the big bang, they find that the math and regular laws of physics just don't work anymore. This is math that they also used for calculating astronomy related things like the orbit of planets around stars. Also they are looking for the God-particle or Higgs-particle. This is related to gravity and mass of objects and therefore very important to astro physicists in terms of orbits, black holes and dark matter. I don't pretend to know even 1% of what they do there at CERN, but I do know that astro physics and "micro physics" like they do at CERN are very closely related.
Also... all things are gravitationally bound. Have you heard that our galaxy and some other (I believe it's M33) are actually heading for a collision? That's gravity at work man !!! Though cosmology may be the study of extremely large scale objects, they are definetly gravity bound, and there is a big ass overlap between cosmology, astro physics and let's say "regular" nuclear physics.
If I didn't look it up on the internet I would've been more proud
I actually know that stuff about the LHC. I'm a total geek about it too. Right now I'm downloading some BBC program about "The Big Bang Machine". Can't wait to see it
What you said about the machine being supercooled at temperatures below the temp of the universe is true and it completely astounded me... did you know that the universe is actually about 4 degrees (Celsius) above the absolute zero (also known as zero kelvin)? Which is totally cool because that means that the "vacuum" of space contains energy.
I recommend that you download the torrents from the following links http://www.mininova.org/tor/842661 http://www.mininova.org/tor/847109 http://www.mininova.org/tor/847113
I thoroughly enjoyed this extraordinary BBC program.
I might have gone a bit overboard here