Created a planet object with mass, radius, color, velocity in the x/y direction, and x/y position as instance variables
Created a system object with list of planet objects as the instance variable
Wrote a 'compute acceleration' method that computes the total gravitational force on a single planet by summing up the gravitational attraction from each planet in the system using: \(F_g = {G(m_1)(m_2) \over r^2}\)
Wrote a 'update' method that takes 'time elapsed' as a parameter. The method first computes the total acceleration on each planet based on the current location of the planets around it. Then, it updates the x/y position & x/y velocity instance variables of each planet in the system using \(x_f = x_i + v_x * t\) and \(v_f=v_i + a_x*t\)
Set a meters to pixel conversion and used it to draw the scaled position of each planet
Set a timescale conversion representing real seconds per simulation second. Used it to update the positions of each planet with respect to time, creating an animation.