Of the millions who saw Haley’s comet in 1986,how many people will live long enough to see it return in the twenty-first

问题描述:

Of the millions who saw Haley’s comet in 1986,how many people will live long enough to see it return in the twenty-first century.

在1986年数以百万计的看到哈雷彗星的人中,有多少人能够长寿到足以目睹在二十一世纪返回.