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| abstraction > science > astronomy > X-ray astronomy | 
| X-ray astronomy comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| astronomy | science | The science that studies the natural world beyond the earth. | 
| X-ray astronomy | astronomy | Detection of stellar and interstellar X-ray emission. Because X-rays are almost entirely filtered out by the Earth's upper atmosphere, the use of balloon- and rocket-borne equipment is essential. | 
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