Two Mercury-bound spacecraft are in the home stretch of their nearly decade-long voyage. The linked spacecraft — one European, the other Japanese — separated from their mother ship on Thursday. CAPE CANAVERAL, Fla. (AP) — Two Mercury-bound spacecraft left their mother ship behind on Thursday and headed down the home stretch of their nearly decade-long voyage to the solar system’s smallest and closest-to-the-sun planet. The linked European a... [2522 chars]