What is a camera/CCD I can buy for astro photography?

Question

I need it to have a time for the length of exposre, digital or analog etc...

Answer 1

A CCD is a Charge Coupled Device, and is the electronic sensor that converts light into electrical signals in the back of a digital camera.
Many telescope manufacturers offer a CCD with a video output that can be used in place of the eyepiece lens.

Answer 2

Try astromart.com and be prepared to spend from hundreds to thousands of dollars for the camera. Make sure you have a very good autoguiding system if you want to do long exposure stuff (another few thousand bucks) and very dark skies.