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calculate the mass of the sun assuming that the earths orbit is circular

and with a radius of 1.5 * 10^8 km

i got the period of the earths orbit around the sun in seconds:

60*60*24*365.25

then used the formula:

T = ((4*Pi^2*r^3)/(G*M))^2

rearranging in terms of M

i change the radius of the orbit to metres instead of kilometres before putting

it into the formula.

but the answer i get is 1.9 * 10^30 kg

and i think the answer should be in the order of 10^40 kg

can anyone suggest where i might be going wrong?

thanks

Nik