On the Hyperion, this convergence happens proper in the middle, at distance marker zero. Each gentle beam travels 15 kilometers. Given gentle travels at 0.3 kilometers per micro-second, the light beams converge in 50 micro-seconds. The buoys transfer previous the Hyperion at two thirds the velocity of mild, or 0.2 kilometers per micro-second. Within the 50 micro-seconds for the sunshine to converge, the buoys move. How a lot? We multiply their speed of 0.2 kilometer per micro-second instances the ...