With fusion rockets, we could get to at least one percent light speed, and maybe ten percent. At one percent, assuming exponential growth, we could colonize the

With fusion rockets, we could get to at least one percent light speed, and maybe ten percent. At one percent, assuming exponential growth, we could colonize the entire galaxy in a million years or so, barely a blink in geological time. We could also colonize objects in the Oort Cloud, just gradually hopping outward from rock to rock, with fusion to power our little colonies, ultimately reaching interstellar distances. It'd be a little slower, but it'd happen without any special effort.