Are Comets Composed of Matter?
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Halley's Comet is blacker than coal & only 10 percent of the surface was active. |
Borrelly's Comet contains no traces of water ice or any water-bearing minerals |
Comets are not
composed of matter.
Introduction
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3 - 4, Science
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10, Technology 11 -
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15,
Opportunities 16 -
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21 - 22, & Economics
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