When Yongle passed away, the succeeding emperor was not interested in sea voyages. Then Zheng was an old man already, too old to sail. The furthest place reached was east african achieved by campus and observing the movement of the stars.
according to menzies' subsequent book 1434, a ming fleet arrived off the tuscan coast, met with the pope, passed along knowledge and fine art to the italians, and viola, the renaissance was born. he even claimed that a sizable community of chinese cheebyes were left behind, and some italian men took the plunge and mated with them, producing mixed dna that could be traced to this day. :p