Two articles you may want to read:
Rising Costs Cloud Future of NASA Planetary Program from Space News discusses new pressures on NASA's planetary budget from dramatic increases in the costs of launch vehicles and shorter term pressures from a rise in the costs to complete the Mars Science Laboratory and the lack of a new budget for FY11.
Lunar Eclipse, the Moon’s Interior, and the Holy GRAIL provides back ground information on the science goals and methods of the GRAIL mission to map the distribution of mass across and within the moon.
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