This is my solar system project

planet_wave2-1.rb

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+require 'yaml'
+require 'colorize'
+class SolarSystem
+attr_accessor :planets, :age
+  #attr_accessor :
+  def initialize(system)
+    @solarsystem = system
+    @planets = {}
+    @age = 4.6e9 #age in years
+  end
+
+  def add_planet(planet)
+    @planets[planet.name] = planet
+
+  end
+
+  def display_planets
+    puts @planets.to_yaml
+  end
+
+  def distance_between_planets(a, b)
+    puts "\n#{a.name} and #{b.name} are #{(a.distance_from_the_sun - b.distance_from_the_sun).abs.round(0)} million kilometers away from each other.".colorize(:light_green)
+  end
+
+  def age_of_planet(planet)
+    puts "\n#{planet.name} is #{(@age / planet.orbital_period).round} years old.  ".colorize(:blue)
+  end
+
+end
+
+
+class Planet
+  attr_reader :name, :num_of_moons  , :made_of, :order_in_our_system, :gravity, :length_of_day, :distance_from_the_sun, :orbital_period
+  def initialize(info)
+    @name = info[:name]
+    @num_of_moons = info[:num_of_moons]
+    @made_of = info[:made_of]
+    @order_in_our_system = info[:order_in_our_system]
+    @gravity = info[:gravity]
+    @length_of_day = info[:length_of_day] #in house
+    @distance_from_the_sun = info[:distance_from_the_sun] # in millions of km
+    @orbital_period = info[:orbital_period]
+  end
+
+
+
+
+  def show_info
+    if @num_of_moons == 1
+      plural = "moon"
+    else @num_of_moons
+      plural = "moons"
+    end
+
+    puts "\nHere is some info about the planet #{@name}, the #{@order_in_our_system} planet from the sun.
+It has #{@num_of_moons} #{plural}, and is made of #{@made_of}.
+Its gravity relative to earth is #{@gravity}, which means a 100 pound person would weigh #{(@gravity * 100).round(0)} pounds on #{@name}.
+#{@name.capitalize} is #{@distance_from_the_sun} million kilometers from the sun, and each day on #{@name} is #{@length_of_day} hours long.".colorize(:light_blue)
+
+  end
+end
+
+
+
+@mercury = Planet.new(name:"Mercury", num_of_moons:0	, made_of:"rock and metal",	order_in_our_system: "first",	gravity:0.378,	length_of_day:4222.6,	distance_from_the_sun:57.9, orbital_period:0.241 )
+@venus = Planet.new(name:"Venus", num_of_moons:0	,made_of:"rock and metal"	,order_in_our_system:"second",	gravity:0.907,	length_of_day:2802,	distance_from_the_sun:108.2, orbital_period:0.615)
+@earth = Planet.new(name:"Earth", num_of_moons:1, made_of:"rock and metal", order_in_our_system:'third', gravity:1, length_of_day:24, distance_from_the_sun:149.6 , orbital_period:1)
+@mars = Planet.new(name:"Mars", num_of_moons:2	,made_of:"rock and metal",	order_in_our_system:'fourth',	gravity:0.377,	length_of_day:24.7,	distance_from_the_sun:227.9, orbital_period:1.88)
+@jupiter = Planet.new(name:"Jupiter", num_of_moons:67,	made_of:"gas",	order_in_our_system:'fifth'	,gravity:2.36,	length_of_day:9.9,	distance_from_the_sun:778.3, orbital_period:11.68)
+@saturn = Planet.new(name:"Saturn", num_of_moons:62,	made_of:"gas"	, order_in_our_system:'sixth'	,gravity:0.916	,length_of_day:10.7	,distance_from_the_sun:1427, orbital_period:29.5)
+@uranus = Planet.new(name:"Uranus", num_of_moons:27,	made_of:"gas"	,order_in_our_system:'seventh'	,gravity:0.889,	length_of_day:17.2,distance_from_the_sun:	2871, orbital_period:84)
+@neptune = Planet.new(name:"Neptune", num_of_moons:14, made_of:'gas', order_in_our_system:'eighth', gravity:1.12, length_of_day:16.1,distance_from_the_sun:4497.1, orbital_period:164.8)
+@pluto = Planet.new(name:"Pluto", num_of_moons:5	,made_of:"rock and metal",	order_in_our_system:'ninth'	,gravity:0.071	,length_of_day:153.3	,distance_from_the_sun:5913, orbital_period: 284)
+
+
+
+@our_system = SolarSystem.new("Our System")
+@our_system.add_planet(@mercury)
+@our_system.add_planet(@venus)
+@our_system.add_planet(@earth)
+@our_system.add_planet(@mars)
+@our_system.add_planet(@jupiter)
+@our_system.add_planet(@saturn)
+@our_system.add_planet(@uranus)
+@our_system.add_planet(@neptune)
+@our_system.add_planet(@pluto)
+
+#@our_system.display_planets
+#@our_system.distance_between_planets(@earth, @mars)
+#@our_system.age_of_planet(@mars)
+
+def list
+  puts "
+1. Mercury
+2. Venus
+3. Earth
+4. Mars
+5. Jupiter
+6. Saturn
+7. Uranus
+8. Neptune
+9. Pluto
+".colorize(:magenta)
+end
+
+#positives = %w(yes sure okay alright surely affirmative gladly yep fine naturally kinda )
+
+def choose_planet
+
+    puts "Select a planet by number:"
+    print " > ".blink.colorize(:yellow)
+    choice = nil
+    while !((1..9).include? choice)
+        choice = gets.chomp.to_i
+        case choice
+        when 1 then planet1 = @mercury
+        when 2 then planet1 = @venus
+        when 3 then planet1 = @earth
+        when 4 then planet1 = @mars
+        when 5 then planet1 = @jupiter
+        when 6 then planet1 = @saturn
+        when 7 then planet1 = @uranus
+        when 8 then planet1 = @neptune
+        when 9 then planet1 = @pluto
+        else
+        puts "Not a choice, please enter a valid number for a planet:".blink.colorize(:yellow)
+        end
+
+    end
+    return planet1
+end
+
+
+
+def intro
+    puts "\nWelcome to our universe! You can learn about the planets and solar systems here.
+I can teach you about specific planets, or you may ask questions about our solar system.".colorize(:light_blue)
+end
+
+def options
+    puts "\nPlease type " + "'display'".colorize(:green) +  " to learn about a specific planet.
+Please type"+  " 'compare' ".colorize(:green) + "to see how far apart two planets are from one another.
+Please type" + " 'age' ".colorize(:green) + "to see how old a planet in our solar system would be in earth years.
+Type"+ " 'exit' ".colorize(:green)  +"if you don't want to learn about the planets."
+end
+
+
+
+def display
+    list
+    planet1 = choose_planet
+    planet1.show_info
+end
+
+def compare
+      puts "\nYou can pick two planets and I will tell you how far apart from each other they
+are when they're at their closest."
+      list
+      planet1 = choose_planet
+      puts "And you'd like to know how far #{planet1.name} is from which other planet:"
+      planet2 = choose_planet
+      @our_system.distance_between_planets(planet1, planet2)
+end
+
+def age
+  puts "Here you can find out how old a certain planet will be in earth years."
+  list
+  planet = choose_planet
+  puts @our_system.age_of_planet(planet)
+end
+
+intro
+response = 'yes'
+positives = %w(y yes sure okay alright surely affirmative gladly yep yup fine naturally kinda )
+while positives.include? response
+  options
+  choice = gets.chomp
+  case choice
+  when 'display' then display
+  when 'compare' then compare
+  when 'age' then age
+  when 'exit' then exit
+  else
+    puts "Sorry, that is not a valid option. Please try again:"
+  end
+  puts "\nWould you like to learn more about the solar system?"
+  response = gets.chomp
+end
+puts "Before you go, why didn't the aliens like the restaurant in space?"
+answer = gets.chomp
+puts "Because there was no atmosphere!\n"