Using the moon for the farthest distance humans have traveled… Voyager has traveled 60,000 times further (14 billion miles).
1 cm x 60,000 = 600 meters
Which is less than 0.5% of the distance to Alpha Centauri (“200 km” in the analogy, 25 trillion miles in real units)
Edit: a neighboring comment pointed out that on this scale of distance to moon ~= 1 cm, the Alpha Centauri system is more like 1000 km away. So voyager is less than 0.1% of the way.
1 cm x 60,000 = 600 meters
Which is less than 0.5% of the distance to Alpha Centauri (“200 km” in the analogy, 25 trillion miles in real units)
Edit: a neighboring comment pointed out that on this scale of distance to moon ~= 1 cm, the Alpha Centauri system is more like 1000 km away. So voyager is less than 0.1% of the way.