Capture some noise.

Put it in a file.

Make it available on the web, the other people can analyze.

Keep the format as simple as possible.

Try sticking it into a byte format or binary format just zero's and one's.

I know nothing about the signals you get from space ?

They are probably analog signals ranging from -x to x ?

Maybe try converting it to 0 to 255.

Simply round it or something.

Alternatively if that's to small range.

Try converting signal to range 0 to 65535.

Or try different formats, for a example a binary format:

Converting each noise signal as follows:
< 0 = 0

= =  1

Maybe aliens use "high signal" to indicate a one.
Maybe aliens use "low signal" to indicate a zero.

Then stick binary stuff in picture format and see what happens ;)

Bye,
  Skybuck.