Glossary of Space Exploration Terminology

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X
X-axis
See roll.
X-band
A range of microwave radio frequencies in the neighbourhood of 8 to 12 GHz.
X-rays
A band of electromagnetic radiation intermediate in wavelength between ultraviolet radiation and gamma rays. Because x-rays are absorbed by the atmosphere, x-ray astronomy is performed in space.

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Rocketry & Space Technology

Glossary courtesy of Robert Braeunig's
Rocketry & Space Technology website.