diff --git a/planets.rb b/planets.rb
new file mode 100644
index 00000000..5aad4838
--- /dev/null
+++ b/planets.rb
@@ -0,0 +1,152 @@
+
+class SolarSystem
+  attr_accessor :planets, :ranked_planets
+
+  # Stores an array of hashes of info on planets
+  def initialize (planets)
+    @planets = planets
+    @ranked_planets = []
+  end
+
+  # Cycles through list of planets
+  # Returns numbered list of planets, w/ respect to sun proximity
+  def cycle_through_system
+    @planets.each do|planet|
+      @ranked_planets.push(planet[:name])
+    end
+    # Ranked numbered list of planets
+    return @ranked_planets
+  end
+
+  # Returns the planet info based on the name user enters
+  def look_up_planet (choice)
+    @planets.each do |planet|
+      if planet[:name] == choice
+        return planet
+      end
+    end
+  end
+end
+
+class Planet
+  attr_accessor :planet_info, :name, :year_length, :sun_distance, :color, :planet_names
+  def initialize (planet_info)
+    @planet_info = planet_info
+    @name = planet_info[:name].upcase
+    @year_length = planet_info[:orbit]
+    @sun_distance = planet_info[:sun_distance]
+    @color = planet_info[:color]
+  end
+  def user_friendly_display
+    return "\nAt #@sun_distance million miles from the sun,\nA year on the #@color planet #@name passes in #@year_length days.\n"
+  end
+end
+
+# Hash storing info about each planet
+planets = [
+  {
+    :name => "mercury",
+    :orbit => 88,
+    :sun_distance => 36,
+    :color => "gray"
+  },
+  {
+    :name => "venus",
+    :orbit => 225,
+    :sun_distance => 67.2,
+    :color => "yellow"
+  },
+  {
+    :name => "earth",
+    :orbit => 365,
+    :sun_distance => 93,
+    :color => "blue"
+  },
+  {
+    :name => "mars",
+    :orbit => 687,
+    :sun_distance => 141.6,
+    :color => "rust"
+  },
+  {
+    :name => "jupiter",
+    :orbit => 4333,
+    :sun_distance => 483.6,
+    :color => "orange"
+  },
+  {
+    :name => "saturn",
+    :orbit => 10756,
+    :sun_distance => 886.7,
+    :color => "gold"
+  },
+  {
+    :name => "uranus",
+    :orbit => 30687,
+    :sun_distance => 1784,
+    :color => "blue"
+  },
+  {
+    :name => "neptune",
+    :orbit => 60190,
+    :sun_distance => 2000,
+    :color => "blue"
+    } ]
+
+    # UI: welcomes and prompts user for input
+    puts "Hello and welcome to Planet Gazer"
+    puts "You can learn about a planet in The Solar System or create your own."
+    puts "Please enter y to begin"
+    play = gets.chomp.downcase
+
+    while play == "y"
+      # Ask user for planet they want to know about
+      puts "\nType the planet name exactly as it appears below to learn more."
+      puts "Or, enter NEW to create your own planet\n"
+
+      solar_system = SolarSystem.new(planets)
+      current_planets = solar_system.cycle_through_system
+      puts "\n"
+      current_planets.each {|planet| puts planet.upcase}
+      user_planet_choice = gets.chomp.downcase
+
+      if user_planet_choice == "new"
+        # have user enter info on their planet
+        puts "\nYay! New planet in the Solar System."
+        puts "Please enter the planet's name"
+        new_planet_name = gets.chomp
+
+        puts "\nPlease enter days it takes #{new_planet_name} takes to orbit the sun. All non-numerical values default to 0 days."
+        new_planet_orbit = gets.chomp.to_i
+
+        puts "\nPlease enter #{new_planet_name}'s distance from the sun in million miles. All non-numerical values default to 0 million miles."
+        new_planet_sun_distance = gets.chomp.to_i
+
+        puts "\nPlease enter #{new_planet_name}'s color."
+        new_planet_color = gets.chomp
+
+        new_planet = {
+          :name => new_planet_name,
+          :orbit => new_planet_orbit, :sun_distance => new_planet_sun_distance,
+          :color => new_planet_color
+        }
+
+        planets.push(new_planet)
+        chosen_planet = solar_system.look_up_planet(new_planet_name)
+        planet_choice = Planet.new(chosen_planet)
+        puts planet_choice.user_friendly_display
+      elsif current_planets.include?(user_planet_choice)
+        # use class planet to collect planet info
+        # use class solar system to return planet info to the user
+        chosen_planet = solar_system.look_up_planet(user_planet_choice)
+        planet_choice = Planet.new(chosen_planet)
+        puts planet_choice.user_friendly_display
+      else
+        puts "\n Uh-oh. You entered an invalid response.\n"
+      end
+      puts "\n\nTo continue learning, enter y."
+      puts "Enter anything else to take a break from learning.\n"
+      play = gets.chomp.downcase
+    end
+    puts "\n Live long and prosper"
+    puts "                    Peace and long life\n"