| Acronym | Meaning |
 | SUSIM | Solar Ultraviolet Spectral Irradiance Monitor |
| SAT | Synthetic Aperture Telescope |
| PM | Pressurized Module |
| TAU | Thousand Astronomical Unit |
| ALEXIS | Array Of Low Energy X-ray Imaging Sensors |
| NRAO | National Radio Astronomy Observatory |
| ARISTOTELES | Applications And Research Involving Space Technologies Observing The Earth's Field From Low Earth Orbiting Satellite |
| OTV | Orbital Transfer Vehicle |
| LLNL | Lawrence-Livermore National Laboratory |
| GR | General Relativity |
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