THE REGOLITH IS THE UPPER BOUNDARY OF THE LUNAR CRUST THE LOWER BOUNDARY LAYER OF THE TENUOUS LUNAR ATMOSPHERE AND CONSTITUTES BOTH A SOURCE AND A SINK FOR EXOSPHERIC GASES THAT MAY EVENTUALLY BECOME SEQUESTERED IN COLD TRAPS. QUESTIONS ABOUT THE
$6,756,953FY2020National Aeronautics and Space AdministrationNASA
Washington University, The