I was reading through my Digital Image Processing book (2nd edition) about something called Fourier transforms. Without explaining the math, suffice it to say that any 2d image can be transformed into a mathematical representation called the Fourier domain. When you do a Fourier transform on a normal image, you get what looks like a cluster of stars. So me being me, I thought, what do you get if you do a Fourier transform on a picture of a cluster of stars? SECRET MESSAGES FROM SPACE!?
If you appreciate this instructible, please visit my blog for more ideas:
1. Image editing software that is capable of Fourier transformation (I'm sure there's a free astronomy tool out there SOMEWHERE)
2. Photos of objects in space (like nebulae)