(单选题)

( ) is needed to calculate orbits of billions of stars through the cosmos.

A.Gaia space telescope

B.A super-computer

C.Not mentioned

D.The pre-print server arXiv

参考答案：A

参考解析：

根据文中第四段turned to the European Space Agency’s Gaia space telescope for help…可知A项正确。选项D在第三段末出现，根据according to a paper Scientists uploaded to the pre-print server arXiv.可知这是论文上传的地址。选项B：超级计算机，明显不符合文中表达。故本题正确答案选A。

知识点：细节题英语阅读理解通用英语

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