| Acronym | Meaning |
 | YSO | Young Stellar Object |
| E | Elliptical (for Galaxies) |
| MOTV | Manned Orbital Transfer Vehicle |
| UOSAT | University Of Surrey Satellite |
| EUV | Extreme UltraViolet |
| CRRES | Combined Release/Radiation Effects Satellite |
| NSI | NASA Science Internet / NASA Standard Initiator / National Environmental Satellite Data And Information Service |
| LST | Local Sidereal Time |
| SAMPEX | Solar Anomalous And Magnetospheric Particle EXplorer |
| GRS | Great Red Spot |
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