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Home This color-coded map shows the strength of surface gravity around Orientale basin on the moon, derived from GRAIL data. (The color scale represents units of “gals” — 1 gal is about 1/1000 of Earth’s surface gravitational acceleration.) (NASA/JPL-Caltech) This color-coded map shows the strength of surface gravity around Orientale basin on the moon, derived from GRAIL data. (The color scale represents units of "gals" -- 1 gal is about 1/1000 of Earth's surface gravitational acceleration.) (NASA/JPL-Caltech)

This color-coded map shows the strength of surface gravity around Orientale basin on the moon, derived from GRAIL data. (The color scale represents units of “gals” — 1 gal is about 1/1000 of Earth’s surface gravitational acceleration.) (NASA/JPL-Caltech)

This color-coded map shows the strength of surface gravity around Orientale basin on the moon, derived from GRAIL data. (The color scale represents units of "gals" -- 1 gal is about 1/1000 of Earth's surface gravitational acceleration.) (NASA/JPL-Caltech)

This color-coded map shows the strength of surface gravity around Orientale basin on the moon, derived from GRAIL data. (The color scale represents units of “gals” — 1 gal is about 1/1000 of Earth’s surface gravitational acceleration.) (NASA/JPL-Caltech)

Orientale basin is about 580 miles (930 kilometers) wide and has three distinct rings, which form a bullseye-like pattern. This view is a mosaic of images from NASA’s Lunar Reconnaissance Orbiter. (NASA/GSFC/Arizona State University)
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