Well, Space Cowboy,
After another long day there's not much to do but watch the stars. While you're at it, give 'em a listen. You might get a signal from a star cluster. Mustn't be rude, if you hear something, holler back.
Click on star clusters to find messages. If you find a message, decode it and send back a message. If the message was decoded correctly, you'll make contact with that star cluster.