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题目材料：
In the 1790s, German astronomer Johann Schroeter postulated an Earthlike rotation period of 23 hours and 21 minutes for Venus, similar to his estimates for Mercury. Because Venus has an atmosphere nearly 100 times as dense as Earth's (it is composed primarily of carbon dioxide rather than nitrogen and oxygen), Venus's surface features are invisible from Earth, and Schroeter could not possibly have tracked them as the planet revolved. Rather, he was most likely trying to apply his view of a myriad of Earths above, all teeming with life, to whatever celestial bodies he saw. Still, at least until the 1960s, the view of Venus as Earth's sister planet was hard to shake: other observers either confirmed Schroeter's results or presented inconclusive counterevidence.
以上解析由 考满分老师提供。
