  In spite of much work, the overall spiral structure morphology of the Milky
Way remains somewhat uncertain. In the last two decades, accurate distance
measurements have provided us with an opportunity to solve this issue. Using
the precise locations of very young objects, for the first time, we propose
that our galaxy has a multiple-arm morphology that consists of two-arm symmetry
(the Perseus and Norma Arms) in the inner parts and that extends to the outer
parts, where there are several long, irregular arms (the Centaurus,
Sagittarius, Carina, Outer, and Local Arms).
