Explanation: On 23 June 2011, Pluto passed in front of a star and cast a small shadow on the Earth. Astronomers from Lowell Observatory observed the rare occultation event from NASA's Stratospheric Observatory for Infrared Astronomy (SOFIA) using HIPO – the High-speed Imaging Photometer for Occultations. Built at Lowell Observatory, HIPO has dual high-speed cameras that record light at two wavelengths simultaneously.


Image credit: Lowell Observatory.