Glossary term: 红外线（IR）
Description: 红外线是一种电磁辐射，波长比可见光长，但比微波和无线电波短。红外线的波长在700纳米到1毫米之间，而可见光的波长在400纳米到700纳米之间。因此，红外线无法通过肉眼看到，只有通过特殊的照相机才能看到。温度在几十开尔文到几千开尔文之间的热体，如太空中的分子云、人体或褐矮星，其电磁辐射的峰值落在红外线区段内。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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