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| abstraction > science > astronomy > X-ray astronomy |
| X-ray astronomy | ||||
| subject | fact | |||
| X-ray astronomy | has definition 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. | ![]() |
| is a kind of astronomy | ![]() |