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aktinijum

soft, silvery-white, radioactive metal which glows in the dark

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See definition for m 2 , above.

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orbita
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The path of one object about another (used here for an object orbiting the sun).

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m2
천문학; 일반 천문학

The magnitude value measured (or predicted) for a comet's nuclear condensation. Note that the true comet nucleus is rarely, if ever, directly observed from the earth because of ...

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천문학; 일반 천문학

The emission of stray light or glare from lighting fixtures in manners that counter the purpose of the light (which is to light what is below); also known as the waste of money ...

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