How to combine digital shots in CS6 for a really long exposure

Hello all,
I want to make a really long-exposure shot using my Canon 40D DSLR.  If I just set the camera to Bulb and take a long exposure, I get a lot of noise that eventually wipes out the image.  I understand that you can achieve the equivalent of a long-exposure by combining several (many?) shorter exposures of the same scene.  This is routinely done in Astrophotography and other areas, but I don't know how to do it.  I tried googling some of the terms, but I guess I didn't use the right terminology because the search didn't turn up what I wanted.
Can this be done in Photoshop, or do I need some other tool to accomplish this?
I'm using CS6 on a Mac Mini with OSX 10.8.4.
Thanks in advance for any help.
Kevin H.

kjhart0133 wrote:
I tried googling some of the terms, but I guess I didn't use the right terminology because the search didn't turn up what I wanted.
The term you want to look for is "dark frame subtraction".
Your Canon 40D has a feature called Long Exposure Noise Reduction. As part of your Google searches you should research whether you need to turn off that feature if you are going to do dark frame subtraction manually.
Sorry I can't be more detailed but I don't actually do much of this, I just remember reading about that stuff.

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