| Acronym | Meaning |
 | ASE | Advanced Space Engine |
| DARA | Deutsche Agentur Fuer Raumfahrtangelegenheiten |
| CCDS | Centers For The Commercial Development Of Space |
| ANSI | American National Standards Institute |
| PLSS | Portable Life Support System |
| E | Elliptical (for Galaxies) |
| CNSR | Comet Nucleus Sample Return |
| UDMH | Unsymmetrical DiMethyl Hydrazine |
| SOHO | SOlar Heliospheric Observatory |
| TDT | Terrestrial Dynamic Time |
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