Dark matter is one of the great mysteries of astronomy and
Dark matter is one of the great mysteries of astronomy and physics, Dark matter is matter that does not radiate electromagnetic energy and so cannot be seen. If astronomers cannot see dark matter how do they know is there?
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dark matter is one of the great mysteries of astronomy and physics dark matter is matter that does not radiate
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a physics lab demonstrates the principles of simple harmonic motion shm by using a spring affixed to a horizontal
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