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There is a lot of light in the world. Some of it is visible. Some of it is nonvisible. Do you think most of the light that hits your eye is light you can see or not? Explain your answer. (

User Alexufo
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The human eye can only see visible light, but light comes in many other "colors"—radio, infrared, ultraviolet, X-ray, and gamma-ray—that are invisible to the eye.

There is infrared light, which, while too red for humans to see, is all around us and even emitted from our bodies. Warm-blooded animals, including humans, radiate infrared light.

There is also X-ray light, which is too blue for humans to see. X-rays are another common light source that many of us have encountered at a doctor's office. They can penetrate skin and muscles, allowing doctors to look at our bones. What you might not know is that the sun also emits X-rays. Lucky for us, the Earth's atmosphere blocks X-ray light.

User Jean Robert
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