A poingnant question asked by David Bowie in 1973.
After today, we might just find the answer. Early this morning, the U.S. scored a huge victory on Mars, landing the largest and most sophisticated mobile laboratory ever launched to another planet.
The hope is that NASA's Mars Science Laboratory and the Curiosity rover will spark a new interest in space exploration.
Will they find life, water or any of the building blocks of life? Will they find alien life?
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