Astronomers use these emission lines to identify the atoms or ions that send out light from the Sun and stars. Near the end of that century Isaac Newton introduced the theory or gravity and. What Is Astronomy Definition History Space Astronomers can therefore look at a distant star and determine its color spectrum. . What are the techniques used by astronomers to study the stars. Stars twinkle for two possible different reasons. The mass of the interstellar medium is determined by a balance between sources which add mass and sinks which remove it. Telescopes have also helped us understand gravity and other fundamental laws of the physical world. The way astronomers can use spectroscopy to identify the elements of something like a faraway stars gaseous makeup can be summarized as follows. These instruments helped us make the first valid measurement of the speed of light. The most common method astronomers u...
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