1.31 ວິວ
John Dobson, an 89 year old with a white ponytail and knack for comedy, is the inventor of the Dobsonian telescope mount, which revolutionized astronomy by making large, inexpensive telescopes and deep space observing available to amateur astronomers around the world.
ປ່ອຍຕົວ: Apr 22, 2005
ເວລາແລ່ນ: 79 ນາທີ
ພາສາ: English
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