In order to run this project you need module Pygame how to install this module is written below

pip install pygame

Next, What you can do in the project you can create planets and watch how planets behave with gravitation so, you need to know hotkeys:

• Z - Decreases time speed
• X - Increases time speed
• O - Turn on the orbit and turn off the orbit
• LMB - create a planet
• TAB - changes a color of planet when you creating a planet
• Mouse wheel - zoom
• Mouse wheel button - moves the camera

If you want change limit of allowed lines just change the variable

your_limit = 3000

or you want to add a planet to the solar system find class Planets and create Planet after that add the variable to the list

Example:

planet = Planet(x, y, radius, color, mass)

if you pass value only on axis x: planet.y_vel = your_speed or if you pass value only on axis y: planet.x_vel = your_speed

neptune = Planet(30.06 * Planet.AU, 0, 14, DEEP_BLUE, 24.622 ** 10 * 6)
neptune.y_vel = 5.4349 * 1000

then add the varible to the list

planets = [sun, earth, mars, mercury, venus, jupyter, saturn, uranus, neptune]