The Interface Region Imaging Spectrograph (IRIS), also called Explorer 94, is a NASA solar observation satellite. The mission was funded through the Small Explorer program to investigate the physical conditions of the solar limb, particularly the chromosphere of the Sun. Image credit: NASA Goddard

Related channels: PARKER SOLAR PROBE (NASA SPACECRAFT), SOLAR ORBITER (ESA SPACECRAFT), THE SUN, SPACE WEATHER, EARTH, STARS

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