diff --git a/new_file.txt b/new_file.txt
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diff --git a/solar_system.rb b/solar_system.rb
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+class Planet
+  attr_accessor :name, :diameter, :mass, :day_length, :moons, :av_density, :distance_from_sun
+  def initialize (planets_info_hash)
+    @name = planets_info_hash[:name]
+    @diameter = planets_info_hash[:diameter]
+    @mass = planets_info_hash[:mass]
+    @day_length = planets_info_hash[:day_length]
+    @moons = planets_info_hash[:moons]
+    @av_density = planets_info_hash[:av_density]
+    @distance_from_sun = planets_info_hash[:distance_from_sun]
+  end
+
+  @@all_planets = [] # To store all planets
+# Method returns array of planets:
+   def self.all_planets
+     @@all_planets
+   end
+
+# Method adds planet to array of planets
+# Method could take multiple arguments, so I could add all planet object in the same time:
+   def self.store_planet(*planets)
+     @@all_planets += planets
+   end
+#Method print info about planet:
+   def print_info_about_planet
+     puts "Name: #{@name}"
+     puts "Diameter: #{@diameter}"
+     puts "Mass: #{@mass}"
+     puts "Length of a day: #{@day_length}"
+     puts "Number of moons: #{@moons}"
+     puts "Average density: #{@av_density}"
+     puts "Distance from the sun (in km): #{@distance_from_sun} \n\n"
+   end
+end
+
+class SolarSystem
+
+  def initialize()
+    @planets = []
+  end
+
+  def add_planet(planet)
+    @planets << planet
+  end
+
+  def add_planets(list_of_planet)
+    @planets += list_of_planet
+  end
+# Display all planets in Solar System:
+  def display_solar_system
+    puts "\n Here is a a list and info about planets in SOLAR SYSTEM: \n "
+    @planets.each do |planet|
+      planet.print_info_about_planet
+    end
+  end
+
+# Method asks for input and calculate distance between planets:
+  def self.calculate_distance
+    while true
+      puts "Distance between planet calculation:"
+      Planet.all_planets.length.times do |i|
+        puts "#{Planet.all_planets[i].name} "
+      end
+      puts "Enter the NAME of first planet:"
+      planet1 = gets.chomp.downcase
+      puts "Enter the NAME  of second planet:"
+      planet2 = gets.chomp.downcase
+      if planet1 == planet2
+        puts "Planets should have different names! \n"
+        next
+      end
+      # Match planet name with planet object:
+      Planet.all_planets.each do |planet|
+         planet1 = planet if planet.name.downcase == planet1
+         planet2 = planet if planet.name.downcase == planet2
+      end
+      if planet1.distance_from_sun > planet2.distance_from_sun
+        result = planet1.distance_from_sun - planet2.distance_from_sun
+      else
+        result = planet2.distance_from_sun - planet1.distance_from_sun
+      end
+      puts "Distance between #{planet1.name} and #{planet2.name} is #{result}"
+      puts "Would you like to get distance between another planets? (yes/no) "
+      answer = gets.chomp.downcase
+      break if answer == 'no'
+    end
+  end # End of Calculate Diatance method
+
+end # End of SolarSystem class
+
+# Create instances of class Planet
+mercury = Planet.new(name: "Mercury", diameter: 4378 , mass: 0.055, day_length: "58 days", moons: 0, av_density: 5.43, distance_from_sun: 57910006)
+venus = Planet.new(name: "Venus", diameter: 12046, mass: 0.815,day_length: "243 days", moons: 0, av_density: 5.24, distance_from_sun: 108199995)
+earth = Planet.new(name: "Earth", diameter: 12756, mass:  1.000, day_length: "24 hours", moons:  0, av_density: 5.43,  distance_from_sun: 149599951)
+mars = Planet.new(name: "Mars", diameter: 6794, mass: 0.107, day_length: "24 hours 37 mins", moons:  2, av_density: 3.93,  distance_from_sun: 227939920)
+jupiter = Planet.new(name: "Jupiter", diameter: 142800,  mass: 318, day_length: "9.9 hours",  moons: 67, av_density: 1.33,  distance_from_sun: 778330257)
+saturn = Planet.new(name: "Saturn", diameter: 120000, mass:  95,  day_length: "10 hours 34 mins", moons:  0, av_density: 0.687, distance_from_sun:  1429400028)
+uranus = Planet.new(name: "Uranus", diameter: 51260, mass: 14.5, day_length: "17 hours 14 mins",  moons: 0, av_density: 1.27,  distance_from_sun: 2870989228)
+neptune = Planet.new(name: "Neptune", diameter: 49598,  mass: 17.2, day_length:  "16 hours 6 minutes",  moons: 14, av_density: 1.63, distance_from_sun:  4504299579)
+pluto = Planet.new(name: "Pluto",diameter: 2290,  mass: 0.002,  day_length: "6 days 9 hours",  moons: 5, av_density: 2.03,  distance_from_sun: 74000000000)
+
+# Add all planets to array:
+Planet.store_planet(mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, pluto)
+
+#Display a list of planets:
+puts "Here is a list of all planets:"
+Planet.all_planets.length.times do |i|
+  puts "#{i+1}. #{Planet.all_planets[i].name} "
+end
+
+while true
+  print "What planet do you want to get info about?"
+  planet_name_input = gets.chomp
+  Planet.all_planets.each do |planet|
+    if planet.name.downcase == planet_name_input.downcase
+      planet.print_info_about_planet
+    end
+  end
+  puts "Would you like to get information about another planet?"
+  answer = gets.chomp.downcase
+  break if answer == 'no'
+end
+
+solar_system = SolarSystem.new # Create instance of Solar System class
+solar_system.add_planet(mercury) # Add one planet to Solar System
+solar_system.add_planet(venus)
+# Display all planets:
+solar_system.display_solar_system
+list_of_planets = [earth, mars, jupiter, saturn, uranus, neptune, pluto]
+solar_system.add_planets(list_of_planets) # Add list of planets to the Solar System
+#solar_system.display_solar_system
+
+# Call method to calculate distance between planets:
+SolarSystem.calculate_distance