DiscoverNASA's Touch the Invisible Sky Audio PodcastsIntroduction (Narrated by Simon Steel)
Introduction (Narrated by Simon Steel)

Introduction (Narrated by Simon Steel)

Update: 2008-01-29
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The Universe is huge. Almost everything that we know about distant objects in the Universe comes from studying the light that is emitted or reflected by them. On Earth, geologists can study rocks by collecting them. Astronauts traveled to the Moon in 1969 and collected moon rocks, but the stars and galaxies are so far away that the primary way we can learn about them is from their light.
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Introduction (Narrated by Simon Steel)

Introduction (Narrated by Simon Steel)