
Lynn Margulis, Distinguished University Professor in the Department of Geosciences at the University of Massachusetts-Amherst speaks during the "Seeking Signs of Life" Symposium, celebrating 50 Years of Exobiology and Astrobiology at NASA, Thursday, Oct. 14, 2010, at the Lockheed Martin Global Vision Center in Arlington, Va. NASA has been researching life in the universe since 1959, asking three fundamental questions: "How does life begin and evolve?"‚ "Is there life beyond Earth and, if so, how can we detect it?" and "What is the future of life on Earth and in the universe?" Photo Credit: (NASA/Bill Ingalls)

Lynn Margulis, Distinguished University Professor in the Department of Geosciences at the University of Massachusetts-Amherst speaks during the "Seeking Signs of Life" Symposium, celebrating 50 Years of Exobiology and Astrobiology at NASA, Thursday, Oct. 14, 2010, at the Lockheed Martin Global Vision Center in Arlington, Va. NASA has been researching life in the universe since 1959, asking three fundamental questions: "How does life begin and evolve?"‚ "Is there life beyond Earth and, if so, how can we detect it?" and "What is the future of life on Earth and in the universe?" Photo Credit: (NASA/Bill Ingalls)

Dan Goldin, NASA's longest serving Administrator from 1992-2001 speaks during the "Seeking Signs of Life" Symposium, celebrating 50 Years of Exobiology and Astrobiology at NASA, Thursday, Oct. 14, 2010, at the Lockheed Martin Global Vision Center in Arlington, Va. NASA has been researching life in the universe since 1959, asking three fundamental questions: ‚"How does life begin and evolve?"‚ "Is there life beyond Earth and, if so, how can we detect it?‚" and "What is the future of life on Earth and in the universe?" Photo Credit: (NASA/Bill Ingalls)

Stephen Price from Lockheed Martin Space Systems Company kicks off the ‚Äö√Ñ√∫Seeking Signs of Life‚Äö√Ñ√π Symposium, celebrating 50 Years of Exobiology and Astrobiology at NASA, Thursday, Oct. 14, 2010, at the Lockheed Martin Global Vision Center in Arlington, Va. NASA has been researching life in the universe since 1959, asking three fundamental questions: "How does life begin and evolve?"‚ "Is there life beyond Earth and, if so, how can we detect it?" and "What is the future of life on Earth and in the universe?" Photo Credit: (NASA/Bill Ingalls)

Dan Goldin, NASA's longest serving Administrator from 1992-2001 speaks during the "Seeking Signs of Life" Symposium, celebrating 50 Years of Exobiology and Astrobiology at NASA, Thursday, Oct. 14, 2010, at the Lockheed Martin Global Vision Center in Arlington, Va. NASA has been researching life in the universe since 1959, asking three fundamental questions: ‚"How does life begin and evolve?"‚ "Is there life beyond Earth and, if so, how can we detect it?‚" and "What is the future of life on Earth and in the universe?" Photo Credit: (NASA/Bill Ingalls)

James Lovelock, Honorary Visiting Fellow of Green Templeton College, University of Oxford speaks during the "Seeking Signs of Life" Symposium, celebrating 50 Years of Exobiology and Astrobiology at NASA, Thursday, Oct. 14, 2010, at the Lockheed Martin Global Vision Center in Arlington, Va. NASA has been researching life in the universe since 1959, asking three fundamental questions: "How does life begin and evolve?"‚ "Is there life beyond Earth and, if so, how can we detect it?" and "What is the future of life on Earth and in the universe?" Photo Credit: (NASA/Bill Ingalls)

James L. Green, Director for Planetary Science in NASA's Science Mission Directorate, helps kick off the "Seeking Signs of Life" Symposium, celebrating 50 Years of Exobiology and Astrobiology at NASA, Thursday, Oct. 14, 2010, at the Lockheed Martin Global Vision Center in Arlington, Va. NASA has been researching life in the universe since 1959, asking three fundamental questions: "How does life begin and evolve?"‚ "Is there life beyond Earth and, if so, how can we detect it?" and "What is the future of life on Earth and in the universe?" Photo Credit: (NASA/Bill Ingalls)

James Lovelock, Honorary Visiting Fellow of Green Templeton College, University of Oxford speaks during the "Seeking Signs of Life" Symposium, celebrating 50 Years of Exobiology and Astrobiology at NASA, Thursday, Oct. 14, 2010, at the Lockheed Martin Global Vision Center in Arlington, Va. NASA has been researching life in the universe since 1959, asking three fundamental questions: "How does life begin and evolve?"‚ "Is there life beyond Earth and, if so, how can we detect it?" and "What is the future of life on Earth and in the universe?" Photo Credit: (NASA/Bill Ingalls)

Dan Goldin, NASA's longest serving Administrator from 1992-2001 speaks during the "Seeking Signs of Life" Symposium, celebrating 50 Years of Exobiology and Astrobiology at NASA, Thursday, Oct. 14, 2010, at the Lockheed Martin Global Vision Center in Arlington, Va. NASA has been researching life in the universe since 1959, asking three fundamental questions: ‚"How does life begin and evolve?"‚ "Is there life beyond Earth and, if so, how can we detect it?‚" and "What is the future of life on Earth and in the universe?" Photo Credit: (NASA/Bill Ingalls)