If our eyes were sensitive only to X rays, the world would appear __________.

A. gray, black, and white like a medical X ray
B. brighter than normal because X rays carry more energy than visible light photons
C. dark because X-ray light does not reach Earth’s surface
D. green, yellow, and orange, because those are the colors of X rays


Answer: C. dark because X-ray light does not reach Earth’s surface

Physics & Space Science

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A. 1 B. 5 C. 1/5 D. ?5 E. 1/ ?5

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A device that shows the bending of particle trails in liquid hydrogen is a

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Why do we call dark matter "dark"?

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