3 THE RELAXATION STATE OF IMPACT BASINS PROVIDES ONE WAY OF PROBING THE THERMAL STRUCTURE OF A PLANETARY BODY. IN THIS PROPOSAL, WE WILLUSE A COMBINATION OF GRAVITY AND OPOGRAPHY DATA TO CHARACTERIZE LARGE, ANCIENT LUNAR IMPACT BASINS ORIGINALLY IDENTIFIED IN IMAGES. IN PARTICULAR, WE WILL USE GRAVITY-DERIVED CRUSTAL THICKNESS MEASUREMENTS TO DETERMINE THE EXTENT TO WHICH RELAXATION HAS TAKEN PLACE, COMPARED WITH YOUNGER, LESS-RELAXED BASINS. WE WILL ALSO USE CRATER COUNTING TO DETERMINE THEIR POSITION IN THE STRATIGRAPHIC COLUMN. WE WILL THEN GO ON TO MODEL THE RELAXATION OF THESE ANCIENT BASINS USING A MULTILAYER VISCOELASTIC CODE. WE CAN USE THIS APPROACH TO INVESTIGATE THE EARLY THERMAL EVOLUTION OF THE MOON AND THE EXTENT TO WHICH ITS LITHOSPHERE COULD SUPPORT ANCIENT LOADS. OUR RESULTS BEAR ON THE BROADER QUESTIONS OF THE TIMING OF LUNAR MAGMA OCEAN SOLIDIFICATION, AND THE INTENSITY OF THE LATE HEAVY BOMBARDMENT. THE PUBLICLY-AVAILABLE GRAVITY AND TOPOGRAPHY DATA COME PRIMARILY FROM GRAIL AND LRO, RESPECTIVELY. THIS PROPOSAL ANALYZES EXISTING SPACECRAFT DATA, AND IN PARTICULAR WILL HELP DETERMINE THE LUNAR LITHOSPHERIC THICKNESS A HIGH PRIORITY AREA OF RESEARCH. IT IS THEREFORE RELEVANT TO THE AIMS OF THE LUNAR DATA ANALYSIS PROGRAM. Other Administrative Action $0 6/20/18 Not listed THE RELAXATION STATE OF IMPACT BASINS PROVIDES ONE WAY OF PROBING THE THERMAL STRUCTURE OF A PLANETARY BODY. IN THIS PROPOSAL WE WILLUSE A COMBINATION OF GRAVITY AND OPOGRAPHY DATA TO CHARACTERIZE LARGE ANCIENT LUNAR IMPACT BASINS ORIGINALLY IDENTIFIED IN IMAGES. IN PARTICULAR WE WILL USE GRAVITY-DERIVED CRUSTAL THICKNESS MEASUREMENTS TO DETERMINE THE EXTENT TO WHICH RELAXATION HAS TAKEN PLACE COMPARED WITH YOUNGER LESS-RELAXED BASINS. WE WILL ALSO USE CRATER COUNTING TO DETERMINE THEIR POSITION IN THE STRATIGRAPHIC COLUMN. WE WILL THEN GO ON TO MODEL THE RELAXATION OF THESE ANCIENT BASINS USING A MULTILAYER VISCOELASTIC CODE. WE CAN USE THIS APPROACH TO INVESTIGATE THE EARLY THERMAL EVOLUTION OF THE MOON AND THE EXTENT TO WHICH ITS LITHOSPHERE COULD SUPPORT ANCIENT LOADS. OUR RESULTS BEAR ON THE BROADER QUESTIONS OF THE TIMING OF LUNAR MAGMA OCEAN SOLIDIFICATION AND THE INTENSITY OF THE LATE HEAVY BOMBARDMENT. THE PUBLICLY-AVAILABLE GRAVITY AND TOPOGRAPHY DATA COME PRIMARILY FROM GRAIL AND LRO RESPECTIVELY. THIS PROPOSAL ANALYZES EXISTING SPACECRAFT DATA AND IN PARTICULAR WILL HELP DETERMINE THE LUNAR LITHOSPHERIC THICKNESS A HIGH PRIORITY AREA OF RESEARCH. IT IS THEREFORE RELEVANT TO THE AIMS OF THE LUNAR DATA ANALYSIS PROGRAM. $0 6/20/18 Not listed THE RELAXATION STATE OF IMPACT BASINS PROVIDES ONE WAY OF PROBING THE THERMAL STRUCTURE OF A PLANETARY BODY. IN THIS PROPOSAL WE WILLUSE A COMBINATION OF GRAVITY AND OPOGRAPHY DATA TO CHARACTERIZE LARGE ANCIENT LUNAR IMPACT BASINS ORIGINALLY IDENTIFIED IN IMAGES. IN PARTICULAR WE WILL USE GRAVITY-DERIVED CRUSTAL THICKNESS MEASUREMENTS TO DETERMINE THE EXTENT TO WHICH RELAXATION HAS TAKEN PLACE COMPARED WITH YOUNGER LESS-RELAXED BASINS. WE WILL ALSO USE CRATER COUNTING TO DETERMINE THEIR POSITION IN THE STRATIGRAPHIC COLUMN. WE WILL THEN GO ON TO MODEL THE RELAXATION OF THESE ANCIENT BASINS USING A MULTILAYER VISCOELASTIC CODE. WE CAN USE THIS APPROACH TO INVESTIGATE THE EARLY THERMAL EVOLUTION OF THE MOON AND THE EXTENT TO WHICH ITS LITHOSPHERE COULD SUPPORT ANCIENT LOADS. OUR RESULTS BEAR ON THE BROADER QUESTIONS OF THE TIMING OF LUNAR MAGMA OCEAN SOLIDIFICATION AND THE INTENSITY OF THE LATE HEAVY BOMBARDMENT. THE PUBLICLY-AVAILABLE GRAVITY AND TOPOGRAPHY DATA COME PRIMARILY FROM GRAIL AND LRO RESPECTIVELY. THIS PROPOSAL ANALYZES EXISTING SPACECRAFT DATA AND IN PARTICULAR WILL HELP DETERMINE THE LUNAR LITHOSPHERIC THICKNESS A HIGH PRIORITY AREA OF RESEARCH. IT IS THEREFORE RELEVANT TO THE AIMS OF THE LUNAR DATA ANALYSIS PROGRAM. $0 6/30/17 2 THE RELAXATION STATE OF IMPACT BASINS PROVIDES ONE WAY OF PROBING THE THERMAL STRUCTURE OF A PLANETARY BODY. IN THIS PROPOSAL, WE WILLUSE A COMBINATION OF GRAVITY AND OPOGRAPHY DATA TO CHARACTERIZE LARGE, ANCIENT LUNAR IMPACT BASINS ORIGINALLY IDENTIFIED IN IMAGES. IN PARTICULAR, WE WILL USE GRAVITY-DERIVED CRUSTAL THICKNESS MEASUREMENTS TO DETERMINE THE EXTENT TO WHICH RELAXATION HAS TAKEN PLACE, COMPARED WITH YOUNGER, LESS-RELAXED BASINS. WE WILL ALSO USE CRATER COUNTING TO DETERMINE THEIR POSITION IN THE STRATIGRAPHIC COLUMN. WE WILL THEN GO ON TO MODEL THE RELAXATION OF THESE ANCIENT BASINS USING A MULTILAYER VISCOELASTIC CODE. WE CAN USE THIS APPROACH TO INVESTIGATE THE EARLY THERMAL EVOLUTION OF THE MOON AND THE EXTENT TO WHICH ITS LITHOSPHERE COULD SUPPORT ANCIENT LOADS. OUR RESULTS BEAR ON THE BROADER QUESTIONS OF THE TIMING OF LUNAR MAGMA OCEAN SOLIDIFICATION, AND THE INTENSITY OF THE LATE HEAVY BOMBARDMENT. THE PUBLICLY-AVAILABLE GRAVITY AND TOPOGRAPHY DATA COME PRIMARILY FROM GRAIL AND LRO, RESPECTIVELY. THIS PROPOSAL ANALYZES EXISTING SPACECRAFT DATA, AND IN PARTICULAR WILL HELP DETERMINE THE LUNAR LITHOSPHERIC THICKNESS A HIGH PRIORITY AREA OF RESEARCH. IT IS THEREFORE RELEVANT TO THE AIMS OF THE LUNAR DATA ANALYSIS PROGRAM. Other Administrative Action $0 6/30/17 Not listed THE RELAXATION STATE OF IMPACT BASINS PROVIDES ONE WAY OF PROBING THE THERMAL STRUCTURE OF A PLANETARY BODY. IN THIS PROPOSAL, WE WILLUSE A COMBINATI $113.1k 7/27/16