1. The problem statement, all variables and given/known data Calculate the total force on the Earth due to Venus, Jupiter and Saturn, assuming all four planets are in a line (see figure). An amateur astronomer measures the masses to be MV = 0.888 ME, MJ = 324 ME, MS = 98.0 ME, and their distances from the Sun are 1.080×10^8 km, 1.500×10^8 km, 7.780×10^8 km and 1.430×10^9 km respectively. The mass of the earth ME is 5.980×10^24 kg and the distance from the earth to the sun is 1.500×10^8 km. The mass of the sun is 1.99×10^30 kg. 2. Relevant equations F = Gm1 m2/r^2 3. The attempt at a solution My problem is how to calculate the distance from each planet to earth. Like, if both Earth and Jupiter are 1.500x10^8 km from the sun, how far apart are they?