Sure! Here are the answers to your questions:
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Gravitational force (the force causing the Andromeda galaxy and the Milky Way galaxy to move towards each other).
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A supermassive black hole (what is at the center of the Milky Way galaxy).
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Yellow (the color of our Sun).
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Visible light (the wave on the electromagnetic spectrum that is visible to the naked eye).
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Wavelength (the measurement of a wave that determines the color).
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White (the color of light that is a blend of all frequencies).