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Both visible and x-rays are both electromagnetic waves. X-rays have much greater energy and a much smaller wave length. x-rays can go through objects such as your skin and show what your bones look like. Since cancers are thicker that other tissues they can also show if your problem is a cancer. The sun puts out most of its electromagnetic waves in the visible spectrum. (It puts out some in other parts in other parts of the spectrum, most of which is blocked by the upper atmosphere except in the polar regions.) Our eyes can see the light reflected from objects illuminated by the sun. No objects reflected x-rays before 1895 and no animal's eyes developed to see them. There is a point when the spectrum gets above the point that people can see. Scientists call that Ultra Violet. That light can not go through your skin. Somewhere between that and the x-ray machine in doctor's offices, Scientists created an arbitrary point establishing soft x-rays. Astronomers use those to see through large dust clouds in various places in and between galaxies.

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