GP-B Gravity Probe B Type Orbiter Launch April 20, 2004 Location Earth orbit Objective Measure two key predictions of Einstein's general theory of relativity Learn more about GP-B Latest News More Gravity Probe B (GP-B) News Article3 Min ReadIntersection of Art and Einstein: Barron Storey’s Gravity Probe B Illustrations Keep Exploring Discover More Topics From NASA James Webb Space Telescope Webb is the premier observatory of the next decade, serving thousands of astronomers worldwide. It studies every phase in the… Perseverance Rover This rover and its aerial sidekick were assigned to study the geology of Mars and seek signs of ancient microbial… Parker Solar Probe On a mission to “touch the Sun,” NASA's Parker Solar Probe became the first spacecraft to fly through the corona… Juno NASA’s Juno spacecraft entered orbit around Jupiter in 2016, the first explorer to peer below the planet's dense clouds to…