Spaceborne study of the Sun has produced spectacular images like these over the years, but still leaves much about our nearest star cloaked in mystery. Now an ultraviolet (UV) telescope with unusually high spectral bandwidth will try to solve one of the most puzzling—why temperatures vary so dramatically between the Sun's surface and the upper limits of its turbulent atmosphere. NASA's Interface Region Imaging Spectrograph (IRIS) mission received “a great insertion orbit” from its ...

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