WHY DO THINGS FLOATВ in space when theyвЂ™re beyond 100km from the Earth? Does gravity magically stop affecting objects at this distance? The official answerВ is that above 100km objects are essentially free-falling, but if something is traveling fast enough laterally, like the space shuttle at 28,000 km/h, then this speed will cause the object to perpetually fallВ along the convex curve of the Earth, thereby never actually reaching the ground-hence maintaining itself вЂњin orbit.вЂќ While graphite has a high melting point (5500вЊ), it is also an excellent conductor of heat-although their spacecraft would most likely fall apart long before it cooked the astronauts to a crisp! Humans cannot survive exposures above 70вЊ. NASA uses aluminum, magnesium, titanium, and epoxy-graphite composites to build its spacecraft-all of which would melt in these high temperatures of the thermosphere.ДЄluminum and magnesium both melt at 660вЊ, titanium at 1668вЊ. A crematorium reaches 1000вЊ, and a blast furnace for melting iron can go as high as 2300вЊ. Beyond this point, the heat increases dramatically, rising rapidly up to 125 miles, where temperatures can reach 2500вЊ!ДЇOR REFERENCE: the oven in your kitchen can hit 240вЊ max. This atmospheric layer starts at about 50 miles high, where temperatures start to rise until the KГЎrmГЎn lineВ is reached at 62 miles. FORGETВ about the lethal Van Allen radiation belts, that stretch for thousands of miles around the Earth, the number one reason why nothing has ever gone into space is THE THERMOSPHERE:

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