add all planet files to project

planet.rb

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+class Planet
+  attr_reader :name, :mass, :diameter, :length_of_day, :distance_from_sun, :mean_temperature, :number_of_moons, :ring_system, :orbital_period
+
+  def initialize(planet_hash)
+    @name = planet_hash[:name]
+    @mass = planet_hash[:mass]
+    @diameter = planet_hash[:diameter]
+    @length_of_day = planet_hash[:length_of_day]
+    @distance_from_sun = planet_hash[:distance_from_sun]
+    @mean_temperature = planet_hash[:mean_temperature]
+    @number_of_moons = planet_hash[:number_of_moons]
+    @ring_system = planet_hash[:ring_system]
+    @orbital_period = planet_hash[:orbital_period]
+  end
+
+  def print_formatted
+    puts "*" * 44
+    puts "Planet name: #{@name}"
+    puts "Mass: #{@mass} * 10^24 kg"
+    puts "Diameter: #{@diameter} km"
+    puts "Length of day: #{@length_of_day} hours"
+    puts "Distance from sun: #{@distance_from_sun} * 10^6 km"
+    puts "Mean temperature: #{@mean_temperature} ˚C"
+    puts "Number of moons: #{@number_of_moons}"
+    puts "Has a ring system: #{@ring_system}"
+    puts "Its orbital period #{@orbital_period} days"
+    puts "*" * 44
+  end
+
+  def calc_year(universe_start)
+    t = Time.now
+    years_around = t.year - universe_start
+    # how many Earth days since the beginning of the universe
+    #
+    days_around = years_around * 365.2
+    planet_age = days_around / @orbital_period
+    puts "The age of the planet #{@name} is #{planet_age.round(3)} years."
+  end
+end

planet_data.csv

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+name,mass,diameter,length_of_day,distance_from_sun,mean_temperature,number_of_moons,ring_system
+Mercury,0.33,4879,4222.6,57.9,167,0,FALSE
+Venus,4.87,"12,104",2802,108.2,464,0,FALSE
+Earth,5.97,"12,756",24,149.6,15,1,FALSE
+Mars,0.642,6792,24.7,227.9,-65,2,FALSE
+Jupiter,1898,"142,984",9.9,778.6,-110,67,TRUE
+Saturn,568,"120,536",10.7,1433.5,-140,62,TRUE
+Uranus,86.8,"51,118",17.2,2872.5,-195,27,TRUE
+Neptune,102,"49,528",16.1,4495.1,-200,14,TRUE
+Pluto,0.0146,2370,153.3,5906.4,-225,5,FALSE

planet_program.rb

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+require './planet'
+require './solar_system'
+
+planets = [
+  {
+    name: "Mercury",
+    mass: 0.330,
+    diameter: 4879,
+    length_of_day: 4222.6,
+    distance_from_sun: 57.9,
+    mean_temperature: 167,
+    number_of_moons: 0,
+    ring_system: false,
+    orbital_period: 88.0,
+  },
+  {
+    name: "Venus",
+    mass: 4.87,
+    diameter: 12104,
+    length_of_day: 2802,
+    distance_from_sun: 108.2,
+    mean_temperature: 464,
+    number_of_moons: 0,
+    ring_system: false,
+    orbital_period: 224.7,
+  },
+  {
+    name: "Earth",
+    mass: 5.97,
+    diameter: 12756,
+    length_of_day: 24.0,
+    distance_from_sun: 149.6,
+    mean_temperature: 15,
+    number_of_moons: 1,
+    ring_system: false,
+    orbital_period: 365.2,
+  },
+  {
+    name: "Mars",
+    mass: 0.642,
+    diameter: 6782,
+    length_of_day: 24.7,
+    distance_from_sun: 227.9,
+    mean_temperature: -65,
+    number_of_moons: 2,
+    ring_system: false,
+    orbital_period: 687.0,
+  },
+  {
+    name: "Jupiter",
+    mass: 1898,
+    diameter: 142984,
+    length_of_day: 9.9,
+    distance_from_sun: 778.6,
+    mean_temperature: -110,
+    number_of_moons: 67,
+    ring_system: true,
+    orbital_period: 4331,
+  },
+  {
+    name: "Saturn",
+    mass: 568,
+    diameter: 120536,
+    length_of_day: 10.7,
+    distance_from_sun: 1433.5,
+    mean_temperature: -140,
+    number_of_moons: 62,
+    ring_system: true,
+    orbital_period: 10747,
+  },
+  {
+    name: "Uranus",
+    mass: 86.8,
+    diameter: 51118,
+    length_of_day: 17.2,
+    distance_from_sun: 2872.5,
+    mean_temperature: -195,
+    number_of_moons: 27,
+    ring_system: true,
+    orbital_period: 30589,
+  },
+  {
+    name: "Neptune",
+    mass: 102,
+    diameter: 49528,
+    length_of_day: 16.1,
+    distance_from_sun: 4495.1,
+    mean_temperature: -200,
+    number_of_moons: 14,
+    ring_system: true,
+    orbital_period: 59800,
+  },
+]
+
+dwarf_planet = {
+  name: "Pluto",
+  mass: 0.0146,
+  diameter: 2370,
+  length_of_day: 153.3,
+  distance_from_sun: 5906.4,
+  mean_temperature: -225,
+  number_of_moons: 5,
+  ring_system: false,
+  orbital_period: 90560,
+}
+
+# Create the universe object
+universe = SolarSystem.new()
+# Create a single planet object, Pluto the dwarf planet
+dwarf = Planet.new(dwarf_planet)
+# Add the single planet, pluto, to the universe
+universe.add_a_planet(dwarf)
+# Create an empty array to hold all the planet objects
+planet_objects = []
+# Go through the planet hash (above) and create planet objects for each
+# Push each of the planet objects to the planet_objects array
+planets.each do |planet_hash|
+  planet_objects.push(Planet.new(planet_hash))
+end
+# Add the array of the other planet objects to the universe
+universe.add_many_planets(planet_objects)
+
+# Print the distance between two random planets
+puts "*" * 44
+puts "Here are a few fun facts:"
+num_planets = universe.planets.length
+universe.distance(universe.planets[rand(num_planets)], universe.planets[rand(num_planets)])
+universe.distance(universe.planets[rand(num_planets)], universe.planets[rand(num_planets)])
+universe.distance(universe.planets[rand(num_planets)], universe.planets[rand(num_planets)])
+universe.distance(universe.planets[rand(num_planets)], universe.planets[rand(num_planets)])
+
+puts "*" * 44
+print "Press enter for more solar system fun."
+gets
+
+# Calculating planet ages with default universe start date of 1979
+puts "This universe was invented in #{universe.formation_year}"
+universe.planets.each do |planet|
+  planet.calc_year(universe.formation_year)
+end
+
+puts "*" * 44
+print "Press enter for more solar system fun."
+gets
+
+# Print the universe fact sheet from assignment wave 1
+puts "*" * 44
+print "Press enter for more solar system fun."
+gets
+universe.print_fact_sheet

solar_system.rb

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+class SolarSystem
+  attr_accessor :planets, :formation_year
+
+  def initialize(formation_year = 1979)
+    @planets = []
+    @formation_year = formation_year
+  end
+
+  def add_a_planet(planet)
+    @planets.push(planet)
+  end
+
+  def add_many_planets(planet_array)
+    @planets = @planets + planet_array
+  end
+
+  def distance(planet1, planet2)
+    distance = (planet1.distance_from_sun - planet2.distance_from_sun).abs
+    puts "The distance between #{planet1.name} and #{planet2.name } is #{distance} * 10^6 km."
+    return distance
+  end
+
+  def print_fact_sheet
+    # Print a menu of options
+    puts "PLANET FACT SHEET".center(64)
+    puts "Information from http://nssdc.gsfc.nasa.gov/planetary/factsheet/"
+    puts "Type the number of the planet to learn more"
+    @planets.length.times do |num|
+      puts "#{num + 1}. #{@planets[num].name}"
+    end
+    puts "0. Exit"
+    # Get user input and convert it to the
+    # planet's index in @planets array
+    choice_index = 100
+    while choice_index >= 0
+      print "Your choice: "
+      choice_index = gets.chomp.to_i - 1
+      # Validate user input
+      while choice_index < -1 || choice_index >= @planets.length
+        puts "Invalid entry. Please enter a number from 0 to #{@planets.length} * 10^6 km"
+        print "Your choice: "
+        choice_index = gets.chomp.to_i - 1
+      end
+      # Print fun planet facts based on user input
+      # Or if the option was -1 then quit
+      if choice_index == -1
+        exit
+      else
+        @planets[choice_index].print_formatted
+      end
+    end
+  end
+
+end