Why NIST Researchers Spent 10 Years Measuring Gravity

Physicists have been trying to measure the fundamental gravitational constant for well over two centuries. The current accepted value of big G, as it’s known, is 6.67430 × 10-11 cubic meters per kilogram per square second. It also has an uncertainty of ±0.00015 × 10-11 m3/(kg s2). As far as constants of the universe go, that’s very uncertain.Stephan SchlammingerSchlamminger is a physicist at the U.S. National Institute of Standards and Technology.Stephan Schlamminger recently completed a 10-year effort at the U.S.…

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