Here are the answers to your questions:
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What is at the center of the Milky Way galaxy?
- A supermassive black hole.
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Our Sun is considered a "medium size/energy" star. What color star is the Sun of our galaxy?
- Yellow.
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Which wave on the electromagnetic spectrum is visible to the naked eye?
- Visible light.
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Which measurement of a wave determines the color?
- Wavelength.
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What color of light is a blend of all frequencies?
- White light.