NASA's Robotic Refueling Mission: The Main Event (video) NASA/Goddard Space Flight Center Share Print E-Mail Loading video... Caption In orbit at 18,000 miles an hour, day and night change places every 90 minutes. Darkness and light, sleep and wake: it's tough to focus on precise tasks floating outside the International Space Station. But not if you're a robot. NASA's Robotic Refueling Mission puts that proposition to the test, with a first-of-its-kind demonstration of a simulated fuel transfer in space, no human in sight. But first, there's a pile of prep before the operation can commence. Credit NASA Goddard Space Flight Center Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.