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Gravity Field of the Moon from the Gravity Recovery and Interior Laboratory (GRAIL) Mission
Ist Teil von
Science (American Association for the Advancement of Science), 2013-02, Vol.339 (6120), p.668-671
Ort / Verlag
United States: American Association for the Advancement of Science
Erscheinungsjahr
2013
Quelle
Science Online_科学在线
Beschreibungen/Notizen
Spacecraft-to-spacecraft tracking observations from the Gravity Recovery and Interior Laboratory (GRAIL) have been used to construct a gravitational field of the Moon to spherical harmonic degree and order 420. The GRAIL field reveals features not previously resolved, including tectonic structures, volcanic landforms, basin rings, crater central peaks, and numerous simple craters. From degrees 80 through 300, over 98% of the gravitational signature is associated with topography, a result that reflects the preservation of crater relief in highly fractured crust. The remaining 2% represents fine details of subsurface structure not previously resolved. GRAIL elucidates the role of impact bombardment in homogenizing the distribution of shallow density anomalies on terrestrial planetary bodies.