上面明亮的北斗七星名字依次是：天枢，天璇，天玑，天权，玉衡，开阳，摇光。

The bright dipper stars above are named Dubhe, Merak, Phecda, Megrez, Alioth, Mizar, and Alkaid.

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光穿过只有八千分之一英寸长的试样需要七微秒，而在空间真空中，光在同样长的时间内可能会行驶一英里多。

Light takes seven microseconds to cross a sample only eight thousandths of an inch long; in the vacuum of space, light would go more than a mile in the same time.

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它是大熊座巨大星群的一部分，上面明亮的北斗七星名字依次是（从左到右顺序）：天枢，天璇，天玑，天权，玉衡，开阳，摇光。

Part of the larger constellation of Ursa Major, the bright dipper stars above are named (left to right along the dipper) Dubhe, Merak, Phecda, Megrez, Alioth, Mizar/Alcor, and Alkaid.

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