The sender writes:
This is a picture of solar coronal loops from the orbiting TRACE satellite.
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Coronal loops form the basic structure of the lower corona and transition region of the Sun.
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TRACE (Transition Region And Coronal Explorer) was a NASA space telescope designed to investigate the connections between fine-scale magnetic fields and the associated plasma structures on the Sun. It launched in 1998 and obtaining its last science image in 2010.