Examines how scientists are revising their notions of the Earth's moon and of the 65 others in the solar system. How some moons may harbor the conditions for life; 1999 as the 30th anniversary of Neil Armstrong and Buzz Aldrin walk on the moon; Moons of the outer solar system having environments which aid the study of the conditions that might have led to life on Earth; Question of whether it is possible to have water without life; Study of the water on Jupiter's moon Europa.
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