Other Worlds This session will report on the latest developments in the search for evidence of extraterrestrial life, a broadly and deeply multidisciplinary, interdisciplinary, and transdisciplinary endeavor. Speakers will address Mars exploration, astrobiology, and the search for extraterrestrial life and the need for planetary protection in the course of this search. The session will focus especially on the Mars Science Laboratory mission to be launched in 2011 -- the first roving analytical laboratory and first dedicated astrobiology mission to Mars since Viking. Speakers also will address the global space community's plans for exploring Europa and other environments potentially habitable for extraterrestrial life, reporting on science goals and technology requirements.