diff --git a/SolarSystem b/SolarSystem
index 487f374..561db92 100755
Binary files a/SolarSystem and b/SolarSystem differ
diff --git a/UML_classes.puml b/UML_classes.puml
index 6ea6ceb..3437058 100644
--- a/UML_classes.puml
+++ b/UML_classes.puml
@@ -1,57 +1,75 @@
 @startuml
+skinparam classAttributeIconSize 0
+
 class SpaceObject {
-  x
-  y
-  radius
-  color
-  update()
-  draw()
+    x
+    y
+    radius
+    color
+    mass
+    update()
+    draw()
 }
 
 class Star {
-  name
-  planets
-  add_planet()
-  set_position()
-  update()
-  draw()
+    name
+    planets
+    add_planet()
+    set_position()
+    update()
+    draw()
 }
 
 class Planet {
-  star
-  orbit_number
-  orbit_radius
-  angle
-  speed
-  direction
-  calculate_position()
-  update()
-  draw_orbit()
-  draw()
+    star
+    orbit_number
+    orbit_radius
+    angle
+    speed
+    angular_speed
+    linear_speed
+    direction
+    calculate_position()
+    update()
+    draw_orbit()
+    draw()
 }
 
 class SolarSystem {
-  stars
-  show_orbits
-  paused
-  create_system()
-  resize()
-  update()
-  draw()
-  toggle_pause()
-  toggle_orbits()
+    width
+    height
+    stars
+    show_orbits
+    paused
+    create_system()
+    get_direction()
+    resize()
+    update()
+    draw()
+    toggle_pause()
+    toggle_orbits()
+    get_all_objects()
+    get_total_mass()
+    get_planet_count()
 }
 
 class SolarApp {
-  system
-  handle_events()
-  draw_panel()
-  run()
+    screen
+    clock
+    system
+    save_callback
+    draw_panel()
+    handle_events()
+    run()
 }
 
+class save_system_to_file
+
 SpaceObject <|-- Star
 SpaceObject <|-- Planet
-Star "1" o-- "many" Planet
-SolarSystem "1" o-- "2" Star
+SolarSystem *-- Star
+Star *-- Planet
 SolarApp --> SolarSystem
+SolarApp --> save_system_to_file
+
 @enduml
diff --git a/UML_objects_end.puml b/UML_objects_end.puml
new file mode 100644
index 0000000..63bfd63
--- /dev/null
+++ b/UML_objects_end.puml
@@ -0,0 +1,45 @@
+@startuml
+object system {
+    paused = True/False
+    show_orbits = True/False
+}
+
+object star1 {
+    name = Star 1
+    x = current_x
+    y = current_y
+    mass = 1.989e30
+}
+
+object star2 {
+    name = Star 2
+    x = current_x
+    y = current_y
+    mass = 1.750e30
+}
+
+object planet1_end {
+    orbit_number = 1
+    angle = changed_angle
+    x = current_x
+    y = current_y
+    direction = 1
+    angular_speed = 0.0097
+    linear_speed = angular_speed * orbit_radius
+}
+
+object planet2_end {
+    orbit_number = 2
+    angle = changed_angle
+    x = current_x
+    y = current_y
+    direction = -1
+    angular_speed = 0.0104
+    linear_speed = angular_speed * orbit_radius
+}
+
+system -- star1
+system -- star2
+star1 -- planet1_end
+star2 -- planet2_end
+@enduml
diff --git a/UML_objects_start.puml b/UML_objects_start.puml
new file mode 100644
index 0000000..4317908
--- /dev/null
+++ b/UML_objects_start.puml
@@ -0,0 +1,39 @@
+@startuml
+object system {
+    paused = False
+    show_orbits = True
+}
+
+object star1 {
+    name = Star 1
+    planets = 11
+    mass = 1.989e30
+}
+
+object star2 {
+    name = Star 2
+    planets = 12
+    mass = 1.750e30
+}
+
+object planet1_start {
+    orbit_number = 1
+    angle = start_angle
+    direction = 1
+    angular_speed = 0.0097
+    mass = 3e24..8e24
+}
+
+object planet2_start {
+    orbit_number = 2
+    angle = start_angle
+    direction = -1
+    angular_speed = 0.0104
+    mass = 3e24..8e24
+}
+
+system -- star1
+system -- star2
+star1 -- planet1_start
+star2 -- planet2_start
+@enduml
diff --git a/build_linux.sh b/build_linux.sh
new file mode 100755
index 0000000..9c0ccce
--- /dev/null
+++ b/build_linux.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -e
+python3 -m venv venv
+source venv/bin/activate
+pip install pygame pyinstaller
+rm -rf build dist *.spec
+pyinstaller --onefile --windowed --name SolarSystem main.py
+cp dist/SolarSystem .
+chmod +x SolarSystem
+echo "Done: ./SolarSystem"
diff --git a/solar_input.py b/solar_input.py
index 22ffa59..699db44 100644
--- a/solar_input.py
+++ b/solar_input.py
@@ -5,14 +5,29 @@ def save_system_to_file(system, filename="solar_state.txt"):
     with open(filename, "w", encoding="utf-8") as file:
         file.write(f"Saved: {datetime.now()}\n")
         file.write(f"Paused: {system.paused}\n")
-        file.write(f"Show orbits: {system.show_orbits}\n\n")
+        file.write(f"Show orbits: {system.show_orbits}\n")
+        file.write(f"Total stars: {len(system.stars)}\n")
+        file.write(f"Total planets: {system.get_planet_count()}\n")
+        file.write(f"Total objects: {len(system.get_all_objects())}\n")
+        file.write(f"Total mass: {system.get_total_mass():.3e}\n\n")
 
         for star in system.stars:
-            file.write(f"{star.name}: x={round(star.x, 2)}, y={round(star.y, 2)}, radius={star.radius}\n")
+            file.write(
+                f"{star.name}: "
+                f"x={round(star.x, 2)}, y={round(star.y, 2)}, "
+                f"radius={star.radius}, mass={star.mass:.3e}\n"
+            )
+
             for planet in star.planets:
                 file.write(
                     f"  Planet orbit={planet.orbit_number}, "
                     f"x={round(planet.x, 2)}, y={round(planet.y, 2)}, "
-                    f"radius={planet.radius}, speed={round(planet.speed, 4)}\n"
+                    f"radius={planet.radius}, "
+                    f"mass={planet.mass:.3e}, "
+                    f"angular_speed={round(planet.angular_speed, 4)}, "
+                    f"linear_speed={round(planet.linear_speed, 4)}, "
+                    f"direction={planet.direction}, "
+                    f"angle={round(planet.angle, 4)}, "
+                    f"orbit_radius={planet.orbit_radius}\n"
                 )
             file.write("\n")
diff --git a/solar_model.py b/solar_model.py
index c95eacf..859f266 100644
--- a/solar_model.py
+++ b/solar_model.py
@@ -18,6 +18,7 @@ TICKET_CONFIG = {
             "first_orbit": 48,
             "orbit_step": 24,
             "color": (255, 190, 40),
+            "mass": 1.989e30,
         },
         {
             "name": "Star 2",
@@ -26,6 +27,7 @@ TICKET_CONFIG = {
             "first_orbit": 58,
             "orbit_step": 38,
             "color": (255, 150, 55),
+            "mass": 1.750e30,
         },
     ],
     "rules": {
@@ -50,7 +52,14 @@ class SolarSystem:
         self.stars = []
 
         for star_data in TICKET_CONFIG["stars"]:
-            star = Star(0, 0, radius=34, color=star_data["color"], name=star_data["name"])
+            star = Star(
+                0,
+                0,
+                radius=34,
+                color=star_data["color"],
+                name=star_data["name"],
+                mass=star_data["mass"],
+            )
             planet_count = star_data["planet_count"]
             planets_per_orbit = star_data["planets_per_orbit"]
             orbit_count = math.ceil(planet_count / planets_per_orbit)
@@ -67,7 +76,16 @@ class SolarSystem:
                         break
 
                     angle = base_angle + place * (2 * math.pi / planets_per_orbit)
-                    planet = Planet(star, orbit_number, orbit_radius, angle, speed, direction)
+                    planet_mass = random.uniform(3.0e24, 8.0e24)
+                    planet = Planet(
+                        star,
+                        orbit_number,
+                        orbit_radius,
+                        angle,
+                        speed,
+                        direction,
+                        mass=planet_mass,
+                    )
                     star.add_planet(planet)
                     created += 1
 
@@ -115,3 +133,9 @@ class SolarSystem:
             objects.append(star)
             objects.extend(star.planets)
         return objects
+
+    def get_total_mass(self):
+        return sum(obj.mass for obj in self.get_all_objects())
+
+    def get_planet_count(self):
+        return sum(len(star.planets) for star in self.stars)
diff --git a/solar_objects.py b/solar_objects.py
index 349d925..944886c 100644
--- a/solar_objects.py
+++ b/solar_objects.py
@@ -3,11 +3,12 @@ import random
 
 
 class SpaceObject:
-    def __init__(self, x, y, radius, color):
+    def __init__(self, x, y, radius, color, mass=1.0):
         self.x = x
         self.y = y
         self.radius = radius
         self.color = color
+        self.mass = mass
 
     def update(self):
         pass
@@ -17,8 +18,8 @@ class SpaceObject:
 
 
 class Star(SpaceObject):
-    def __init__(self, x, y, radius=34, color=(255, 185, 40), name="Star"):
-        super().__init__(x, y, radius, color)
+    def __init__(self, x, y, radius=34, color=(255, 185, 40), name="Star", mass=1.989e30):
+        super().__init__(x, y, radius, color, mass)
         self.name = name
         self.planets = []
 
@@ -46,13 +47,15 @@ class Star(SpaceObject):
 
 
 class Planet(SpaceObject):
-    def __init__(self, star, orbit_number, orbit_radius, angle, speed, direction, radius=None, color=None):
+    def __init__(self, star, orbit_number, orbit_radius, angle, speed, direction, radius=None, color=None, mass=None):
         self.star = star
         self.orbit_number = orbit_number
         self.orbit_radius = orbit_radius
         self.angle = angle
         self.speed = speed
+        self.angular_speed = speed
         self.direction = direction
+        self.linear_speed = abs(self.angular_speed * self.orbit_radius)
 
         if radius is None:
             radius = random.randint(8, 13)
@@ -64,8 +67,11 @@ class Planet(SpaceObject):
                 random.randint(90, 255),
             )
 
+        if mass is None:
+            mass = random.uniform(3.0e24, 8.0e24)
+
         x, y = self.calculate_position()
-        super().__init__(x, y, radius, color)
+        super().__init__(x, y, radius, color, mass)
 
     def calculate_position(self):
         x = self.star.x + math.cos(self.angle) * self.orbit_radius
@@ -73,7 +79,7 @@ class Planet(SpaceObject):
         return x, y
 
     def update(self):
-        self.angle += self.speed * self.direction
+        self.angle += self.angular_speed * self.direction
         self.x, self.y = self.calculate_position()
 
     def draw_orbit(self, screen, pygame):