NASA Tests New Spacecraft Propellant Gauge on Lunar Lander

Ellen Bausback It’s easy to measure fuel in tanks on Earth, where gravity pulls the liquid to the bottom. But in space, the game changes. Quantifying fuel that’s floating around inside a spacecraft’s tank isn’t so simple. “Because of the very small amount of gravity, fluid doesn’t settle to the bottom of propellant tanks but rather clings to the walls and could be anywhere inside,” said Lauren Ameen, deputy…