During a special observation run from Jan. 15 to Jan. 22, the Transiting Exoplanet Survey Satellite ( TESS ) repeatedly observed comet 3I/ATLAS as it headed out of our solar system. With its wide field of view, TESS recorded the comet as a bright, fast-moving dot dragging a faint tail across a crowded starfield. Interstellar comet 3I/ATLAS (circled) is a bright dot with a tail passing through a field of stars in this video from NASA’s TESS (Transiting Exoplanet Survey Satellite). The sequence uses 28 hours of TESS full frame images collected over Jan. 15 and Jan. 18 to 19. This capability helped astronomers spot comet 3I/ATLAS before they even knew it was there.