They were searching for Vulcan, a putative planet inside the orbit of Mercury, by looking for its transits.

他们通过寻找凌日来寻找水星轨道内的一个假定的行星伏尔甘。

youdao

They were searching for Vulcan, a putative planet inside the orbit of Mercury, by looking for its transits.

他们通过寻找凌日来寻找水星轨道内的一个假定的行星伏尔甘。

youdao