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| | Dictionary of Technical Terms for Aerospace Use - M (Site not responding. Last check: 2007-10-11) |
 | | vehicle occupied by one or more persons who normally have control over the movements of the vehicle, as in a manned aircraft or spacecraft, or who perform some useful function while in the vehicle. |
 | | In general, the substances of which rockets and space vehicles are composed; specifically, the metals, alloys, ceramics, and plastics used in structural, protective, and electronic functions. |
 | | radiation required to kill, within a specified period, 50 percent of the individuals of a group of animals or organisms. |
| www.jsc.nasa.gov /er/seh/m.html (8270 words) |
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