BARREL (Balloon Array for Radiation-belt Relativistic Electron Losses) news Scientific BalloonsOn Cupid! On, Donner and BARREL!TheWorldsNewsDecember 23, 2023 by TheWorldsNewsDecember 23, 20230 NASA In this image from Dec. 8, 2017, four reindeer walk past the Balloon Array for Radiation-belt Relativistic Electron Losses, or BARREL, payload on the...