Gravity!

While gravity is much weaker than other basic forces in nature, such as magnetism and electricity, its effects are ubiquitous and dramatic. Gravity controls everything from the motion of the ocean tides to

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GRACE

The positions of the two GRACE satellites change in response to variations in Earth's gravity field. When the two spacecraft pass over the ocean, the distance between them is unchanged (first panel)

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Operation System

Satellite (JPL/DSS) Launcher (DLR/Eurokot) Operations (DLR/GSOC) Science (CSR/JPL/GFZ) Orbit Launch: February 2002 Altitude: 485 km Inclination: 89 deg Eccentricity: ~0.001 Lifetime: 5 years

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