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+# Simple Gravity Simulator in Python
+
+This is a simple gravity simulator written in Python. It uses the Tkinter library to display the simulation and the Universal Gravitation formula to calculate the forces between the objects.
+
+## How to use
+
+- add or remove objects by modifying the code in `main.py`
+- `python main.py` to run the simulation
+- you can accelerate the simulation with the first slider
+- you can change the scale of the simulation with the second slider
+- you can change the frame rate of the simulation with the third slider
+
+## Example
+
+![example](./images/example.gif)
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diff --git a/main.py b/main.py
index d28f805..41c9a2c 100644
--- a/main.py
+++ b/main.py
@@ -70,6 +70,11 @@ class Planet:
         n_x = vec_y * -1
         n_y = vec_x * 1
 
+        n_len = sqrt(n_x ** 2 + n_y ** 2)
+
+        n_x /= n_len
+        n_y /= n_len
+
         self.set_initial_velocity(n_x * v, n_y * v)
 
 class System():
@@ -95,6 +100,7 @@ class System():
 
 def main():
     window = Tk()
+    window.title("Simple Grav Sim")
 
     canvas = Canvas(window, bg="black", width=WIDTH, height=HEIGHT)
     canvas.pack()