Adventurers' lives often depend on lifelines. On the greatest quest man can have, you too need a secure link! Deep into space, beyond the outer boundaries of earth's atmosphere, man has ventured where there is no air to support life. Astronauts (a word that comes from two Greek words meaning "sailors among the stars") have traveled hundreds of thousands of miles in space. While on a voyage, these men remain alive only by breathing the oxygen brought with them from earth.
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