Given that Earth orbits the Sun with a semimajor axis of 1.000 AU and an approximate orbital period of 365.24 days, determine the mass of the Sun. (1 AU = 1.496 ✕ 1011 m)

Answer 1

Just plug your numbers into the formula from Kepler's 3rd law:

T^2 = 4π^2 a^3/(GM)
where a is the semimajor axis of the orbit.

Answer 2

I have laid this all out for you.
Now Steve has done the same.
Please try yourself now.