outer space. Here is the text of the message that they decoded:
"This really works! Just send 5*10^50 atoms of hydrogen to each of the five
star systems listed below. Then, add your own system to the top of the
list, delete the system at the bottom, and send out copies of this message
to 100 other solar systems. If you follow these instructions, within 0.25
of a galactic rotation you are guaranteed to receive enough hydrogen in
return to power your civilization until entropy reaches its maximum!"
So I rarely post random items, but this amused me greatly.