Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Apollo 15 astronaut James Irwin works on the first Lunar Roving Vehicle , before he and fellow astronaut David Scott take it out for a drive. The explorations conducted during the Apollo lunar missions discovered much about our Moon , including that the Moon is made of ancient rock, that the Moon's composition is similar to Earth's, that life is not evident there, that the Moon underwent a great hot melting in its distant past, that the Moon has suffered from numerous impacts as shown by its craters, and that the Moon's surface is covered by a layer of rock fragments and dust.
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