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Waveform Audio File Format  |  1995-06-29  |  408.0 KB  |  1 channel  |  22,050 sample rate  |  37 seconds  |  [TEXT/LMAN]
Transcription: The universe contains everything that exists, not only the Earth and everything on it, but also all the planets, stars, and galaxies, and the space in between them. The Sun, at the center of the solar system, is just one of about a hundred billion stars in our galaxy, or collection of stars called the Milky Way. Astronomers have estimated that there are about a hundred billion other galaxies in the universe. Most scientists think that the universe formed about 15 billion years ago in an enormous explosion called the Big Bang. They also think that the universe is expanding.