Moe explains his theory of time travel using a piece of string . He posits that our lifetimes are like a string; if you roll it into a ball, "all the days of your life" touch each other, allowing for travel between points.
The calculating device Captain Galaxy uses on his show is designed to look strikingly similar to the Handlink Al uses throughout the series, further hinting at Moe's influence on Sam's future work. Watching the Episode [S3E13] Future Boy - October 6, 1957
In a poignant ending, it is revealed that a young Sam Beckett actually wrote a letter to Captain Galaxy, and Moe's theory of time travel—the string theory—is the very one Sam eventually uses to build Project Quantum Leap. Behind-the-Scenes & Trivia Moe explains his theory of time travel using