CALET (1 of 3) (IMAGE) NASA/Johnson Space Center Caption The HTV5 CALorimetric Electron Telescope (CALET) Flight Crew Interface Test (FCIT). CALET will search for signatures of dark matter and provide the highest energy direct measurements of the cosmic ray electron spectrum. Credit NASA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.