NASA has selected four proposals focusing on astrophysics priorities in lunar science to facilitate the nation's exploration program. The proposed studies are part of a NASA effort to develop new opportunities to conduct important science investigations during the planned renewal of human exploration of the moon. The newly-announced proposals for concept studies may lead to experiments placed on the moon that would allow for unprecedented tests of Einstein's General Theory of Relativity, instruments to probe the early evolution of structure in the universe, and observation of X-rays produced by the charged particles the sun emits, known as the solar wind.

http://www.moondaily.com/reports/NASA_Selects_Astrophysics_Projects_For_New_Science_On_The_Moon_999.html