Astronomy Picture of Day: Surface Gravity of Eart# Astronomy - 天文
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GRACE Maps the Gravity of Earth
Credit: GeoForschungsZentrum Potsdam, CSR U. Texas, JPL, NASA
Explanation: Why do some places on Earth have higher gravity than others? Sometimes the
reason is unknown. To help better understand the Earth's surface, slight distance changes
between a pair of identically orbiting satellites named GRACE have been used to create the
best ever map of Earth's gravitational field. High points on this map, also colored red, indicate
areas where gravity is slightly
Credit: GeoForschungsZentrum Potsdam, CSR U. Texas, JPL, NASA
Explanation: Why do some places on Earth have higher gravity than others? Sometimes the
reason is unknown. To help better understand the Earth's surface, slight distance changes
between a pair of identically orbiting satellites named GRACE have been used to create the
best ever map of Earth's gravitational field. High points on this map, also colored red, indicate
areas where gravity is slightly