Seems we're the result of interstellar travel I think we're doing alright in the 'travel' out of the solar system deal. Think about this, If it indeed does take light years to travel to other worlds. Don't you think it's likely that we'd send our DNA instead? We could populate a planet with our 'children'. Launch rockets to every planet in every direction with a 'cum bomb' that when it explodes seeds alien DNA all over the planet like a bukkake film. Some will succeed, others wont. The ones that do means our species will eventually cover the universe. Perfect virus.