| Acronym | Meaning |
| SEPAC | Space Experiments With Particle Accelerators |
| AGU | American Geophysical Union |
| FIRAS | Far InfraRed Absolute Spectrophotometer |
| HSP | High Speed Photometer |
| ENAC | Energetic Neutral Atom Camera |
| GR | General Relativity |
| SAM | Shuttle Activation Monitor |
| MODIS | Moderate Resolution Imaging Spectrometer |
| SUSIM | Solar Ultraviolet Spectral Irradiance Monitor |
| MET | Mission Elapsed Time |