Great Wall Can Seen From Space_文教Education
first, the good news: the great wall of china can, indeed, be seen from outer space with the naked eye.
so education officials, who fretted about changing textbooks - which have long held that the great wall and the dykes in the netherlands were the only man-made structures visible from space - can breathe easy.
yang liwei, the nation’s first spaceman, disappointed a lot of chinese when he said he did not see the wall during his orbit of less than 24 hours in october 2003, prompting calls for revisions in textbooks. but there is a rider: there are many, many structures which can also be seen, such as the pyramids of egypt, airports, highways - and even beijing’s third ring road.
apparently, it requires an atmospheric "perfect storm" in outer space, defined as an altitude of about 350 kilometres and you have to be in the right place at the right time, amid the right conditions to spot a particular structure.
chinese-american astronaut leroy chiao, who has been on three space flights and is currently coming to the end of his six-month stint on the joint us-russian space station, has provided the first photographic evidence of sections of the great wall using commercially available equipment.
learn more from this article
so education officials, who fretted about changing textbooks - which have long held that the great wall and the dykes in the netherlands were the only man-made structures visible from space - can breathe easy.
yang liwei, the nation’s first spaceman, disappointed a lot of chinese when he said he did not see the wall during his orbit of less than 24 hours in october 2003, prompting calls for revisions in textbooks. but there is a rider: there are many, many structures which can also be seen, such as the pyramids of egypt, airports, highways - and even beijing’s third ring road.
apparently, it requires an atmospheric "perfect storm" in outer space, defined as an altitude of about 350 kilometres and you have to be in the right place at the right time, amid the right conditions to spot a particular structure.
chinese-american astronaut leroy chiao, who has been on three space flights and is currently coming to the end of his six-month stint on the joint us-russian space station, has provided the first photographic evidence of sections of the great wall using commercially available equipment.
learn more from this article