![]() |
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 | ![]() |