Waves of infrared radiation are longer than waves of visible light, so ordinary digital cameras dont see them, and neither do the eyes of human beings. Although invisible to the eye, longer infrared radiation can be detected as warmth by the skin.

　　Thats a key idea to why WISE will be able to see things other telescopes cant. Not everything in the universe shows up in visible light. Asteroids, for example, are giant rocks that float through space but they absorb most of the light that reaches them. They dont reflect light, so theyre difficult to see. But they do give off infrared radiation, so an infrared telescope like WISE will be able to produce images of them. During its mission WISE will take pictures of hundreds of thousands of asteroids.

　　Brown dwarfs are another kind of deep-space object that will show up in WISEs pictures. These objects are failed stars which means they are not massive enough to jump start the same kind of reactions that power stars such as the sun. Instead, brown dwarfs simply shrink and cool down. Theyre so dim that theyre almost impossible to see with visible light, but in the infrared spectrum they glow.

　　1 .What is so special about WISE?

　　A It is small in size but carries a large camera.

　　B It is as small as a trashcan.

　　C Its digital camera can help astronomers to see the unknown space.

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