[填空题]
Given that the acceleratilamwf0:* r8ux 9tdbp-xxc 05don of gravity at the surface of j9hie 0 99ouxyy 9yzl 2lsg3)fMars is 0.38 of what it is on Earth, and t3zl9iyo0x)2 y hes9y fl9u9j ghat Mars’ radius is 3400 km, determine the mass of Mars. $\times 10^{23}$
