哈勃太空望遠(yuǎn)鏡在繞地軌道環(huán)行超過20年了,它仍在不斷地提供給我們很多寶貴的發(fā)現(xiàn).around earth就是修飾orbit,沒啥特殊用法.不是說唯一的天體要加THE嗎？這里earth 指地球，為什么沒有加the？在請(qǐng)教下文中的a factor of ten的意思。The Hubble, when it was launched, represented an increase in capability of other telescopes on the ground by a factor of ten. The last time in human history in astronomy that we leaped a factor of ten, in one step, was when Galileo stopped using his eye and put the first telescope to his eye按照你的說法，應(yīng)該是around the earth。a factor of ten就是10倍的意思。