It is esy to find the size or mass of planet once we know the distance.
Mass of all planets such as earth,mercury,jupiter etc can be found by using the only formula given below
M = 4*pi*pi*r*r*r/G*T*T
where. M = mass of the planent or sun or moon etc
pi = 22/7
r = distance between Two planent eg:moon and earth
T= period of revolution of earth
g = gravitation constant.
How the distance is calculated ?
laser pulse method
radio-echo method
parallax method
eg laser pulse method - laser pulse is send from moon to the earth in order to find mass of earth
to find mass of moon laser pulse is send from earth to moon.The time interval is noted.
distance r = c*t/2 where c = velocity of laser pulse
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