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Gravity: It's What Keeps Us Together
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The Gravity Recovery And Interior Laboratory, or GRAIL, launched on September 8, 2011. It continues to fly its twin spacecraft in tandem around the Moon to precisely measure and map variations in the Moon's gravitational field. This detailed information will reveal differences in density of the Moon's crust and mantle and will help answer fundamental questions about the Moon's internal structure, thermal evolution and history of collisions with asteroids.


The Juno mission, launched in August 2011, will improve our understanding of our solar system's beginnings by revealing the origin and evolution of Jupiter, in part by mapping Jupiter's magnetic and gravity fields to reveal the planet's deep structure.


The Gravity Recovery and Climate Experiment, or GRACE, is composed of twin satellites launched in March 2002 that are making detailed measurements of Earth's gravity field that will lead to better understanding of the Earth's natural systems.

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Last Updated: 12 Sep 2014