The Universe Doesn't Want to Speak Up About Its Secrets

The universe doesn't want to speak up about its secrets and just wants to like, slip it to us on background. So then the cosmic microid background is a sort of left over light from the early universe. What would be the cosmic gravitational background? We don't know exactly, because we haven't seen it. The limitation on seeing this thing is making our experiments sensitive enough to listen to these very, very quiet signals.