The spacecraft, which is about the size of a small car, is set to dive within 3.86 million miles of the solar surface at 6:40 a.m. ET on Tuesday. It will fly by at about 430,000 mph. Mission controllers won’t be able to communicate with the probe during the maneuver, so NASA will have to wait about three days to pick up a signal that the spacecraft survived its rendezvous with the sun.The mission was designed to study the outermost part of the sun’s atmosphere, an ultrahot region known as the corona. Scientists are keen to observe the corona up close because researchers have long puzzled over why the outer layer of the sun’s atmosphere is hundreds of times hotter than the star’s surface. Is the mission even possible ?
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