| Abbreviation | Definition |
|---|---|
| BASP | Biomedical and Astronomical Signal Processing |
| BAT | Burst Alert Telescope |
| BATSE | Burst and Transient Source Experiment |
| BATTERS | Bisei Asteroid Tracking Telescope for Rapid Survey |
| BAUT | Bad Astronomy and Universe Today |
| BAV | Bundesdeutsche Arbeitsgemeinschaft fur Veraenderliche Sterne |
| BAWG | BRICS Astronomy Working Group |
| BBH | Big Black Hole |
| BBL | Broad Band Light |
| BBT | Big Bang Theory |
| BCCP | Berkeley Center for Cosmological Physics |
| BCG | Blue Compact Galaxy |
| BCRS | Barycentric Celestial Reference System |
| BD | Brown Dwarf |
| BE | Bright Elements |
| BG | Big Gas |
| BHAS | Black Hills Astronomical Society |
| BHB | Black Hole Bang |
| BHH(s) | Black Hole(s) |
| BIS | British Interplanetary Society |