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NASA’s Orion spacecraft is being built to take humans to Mars and back to Earth. The heat shield on Orion withstood temperatures of approximately 4,000°F during the Earth re-entry phase of Orion’s first spaceflight, Exploration Flight Test-1. Just how hot is 4,000°F?
A. About as hot as glowing orange lava flowing from volcanoes
B. About the same as the Earth’s molten core
C. About as hot as the surface of the Sun
D. About as hot as a summer day in Arlington, VA