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astronomy
subject			fact

astronomy	has definition The science that studies the natural world beyond the earth.
	is a kind of science

Kinds of astronomy :

• extragalactic astronomy (2 kinds, 6 facts) - The field that deals with objects beyond the Milky Way, especially galaxies and quasars.
• galactic astronomy (1 kind, 4 facts) - The study of the Milky Way.
• radio astronomy (2 facts) - Study of the universe at the radio wavelengths of electromagnetic energy.
• X-ray astronomy (2 facts) - 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.