[填空题]
The asteroid belt betwerple1siq0j u1fn/jkifz2tr- k te6v,+7m * v9e k*1 y)9)w/ovu m, vypkr:ijvmn Mars and Jupiter consists of many fragments (which some space scie v m,r/uyw9kvpi j))ko*1m:v yntists think came from a planet that once orbited the Sun but was destroyed).
(a) If the center of mass of the asteroid belt (where the planet would have been) is about three times farther from the Sun than the Earth is, how long would it have taken this hypothetical planet to orbit the Sun?$\approx$ y
(b) Can we use these data to deduce the mass of this planet?
