不过主行星在一段时间内几次逆行是平常之事。
It is common for a major planet to retrograde for several months at a time.
科学家说这颗行星与其主恒星的距离适中，可能存在水分。
Scientists say the planet's distance from its primary star means it may contain water.
这些纪念碑是行星的主网格点。
其中许多行星的轨道距其主恒星极近，因此这些行星是炽热的。
Many of them orbit precariously close to their parent stars, so they scorching hot.
其中许多行星的轨道距其主恒星极近，因此这些行星是炽热的。
Many of them orbit precariously close to their parent stars, so they scorching hot.
应用推荐