People have been listening to this on our planet for sometime. Atmospherics or 'sferics' for short are generated by lighting and are actually very wide band in coverage. Yes they can be heard on shortwave radios as a crackle and loud crash but the one I listen with is custom made for this purpose (BBB-4 VLF receiver). They can be quite interesting to listen to as lighting produces some interesting sounds when cut off in frequency; whistlers, Chorus and tweeks for example. Other interesting sounds can be heard from Auroras when their is a geomagnetic storm expected.

In astrophotography you will find cheap is not the way to go, you are best off buying a mount! I own a Celestron CG-5 (new version) mount which does both fine for short-focal length (50mm-to200mm) piggyback DSLR, and at prime focus with my C8-SCT. - You can shoot with out a mount, make sure you use the smallest focal-length lens you got. gives you 1-30+ seconds (depending on make, will will need to stop it down to reduce bloating of starts and abrations (Decrease F number)) - Buy a good mount. If you want it bad but dont have the money get the CG-5. - invest in a remote shooting device, your hand/ or vibrations will kill your pictures! (wireless, or build your own with a 2.5mm stereo plug and a switch) I use my computer + USB remote shooting to my camera for quick feedback of the pictures (Canon rebel XS)