A moon with a small mass is orbiting a large planet of unknown mass with an orbital period of ten to the fifth seconds and with a semimajor axis of ten to the eighth meters. Which of the following values is closest to the mass, in kilograms, of the planet?

W) 6 times 10 to the 15\({}^{\rm th}\)

X) 6 times 10 to the 20\({}^{\rm th}\)

Y) 6 times 10 to the 25\({}^{\rm th}\)

Z) 6 times 10 to the 30\({}^{\rm th}\)
Y) 6 TIMES 10 TO THE 25TH