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我们知道,天文学是研究天体的一门科学。但是,天体离我们极远,天文学家不可能到某一个天体上面去直接研究它。那么怎样去研究天体呢?是研究天体上所发出来的光。这样就可以知道天体的各种性质。天文学家应用各种仪器——望远镜、分光仪、天体照相仪——来测定天体的温度、化学成分、大小、运动、磁场等等。这样一来,就使我们对天体的认识大大地丰富了起来。光是电磁波的一种。电磁波的波长不同,性质也就不同。我们眼睛所能见到的电磁波,波长大约从四千埃到八千埃(一埃等於一厘米的一万万分之一)。这就是可见光,
We know that astronomy is a science that studies celestial bodies. However, the celestial body is far away from us. It is impossible for astronomers to go directly to a particular celestial body to study it. So how do you study celestial bodies? It is to study the light emitted by celestial bodies. In this way, you can know the various properties of the celestial body. Astronomers use a variety of instruments - telescopes, spectrometers, celestial photography - to determine the temperature, chemical composition, size, motion, magnetic field, etc. of celestial bodies. In this way, we have greatly enriched our understanding of heavenly bodies. Light is a kind of electromagnetic wave. Different wavelengths of electromagnetic waves have different properties. The electromagnetic waves that our eyes can see range from about 4,000 to 8,000 angstroms (one angstrom equals one tenth of a centimeter). This is visible light,