Understanding Comets - Key To Human Survival & Exploration - Full Documentary
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Understanding Comets - Key To Human Survival & Exploration - Full Documentary
Comets are cosmic snowballs of frozen gases, rock and dust that orbit the Sun. When frozen, they are the size of a small town. When a comet's orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that stretches away from the Sun for millions of ...
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