This is the stage 2 of my solar planet project

solar.rb

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+puts "Please select a planet that you want to learn about by submitting the corresponding number
+1. Mercury\n
+2. Venus\n
+3. Earth\n
+4. Secret Earth\n
+5. Mars\n
+6. Jupiter\n
+7. Saturn\n
+8. Uranus\n
+9. Neptune\n
+10. Pluto\n
+11. Planet 9\n
+12. Exit"
+user_planet = gets.chomp.downcase
+
+valid_op = ["Mercury", "Venus", "Earth", "Secret Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "
+Pluto", "Planet 9", "Exit", ("1..12")]
+while valid_op.include?(user_planet)
+  puts "Please enter a valid planet or the number next in the list "
+  user_planet = gets.chomp.downcase #Ask again if user input is no one of valid planet
+  end
+
+class Planet
+  attr_accessor :name, :type, :moons, :gravity, :diameter, :solar_year, :distance_from_sun
+  def initialize(planet_hash)
+    @name = planet_hash[:name]
+    @type = planet_hash[:type]
+    @moons = planet_hash[:moons]
+    @gravity = planet_hash[:gravity]
+    @diameter = planet_hash[:diameter]
+    @solar_year = planet_hash[:solar_year]
+    @distance_from_sun = planet_hash[:distance_from_sun]
+    puts "hello world"
+  end
+end
+
+def mercury
+  Planet.new(name: "Mercury", type: "Terrestreal", moons: "None", gravity: "3.7 m/s²",
+  diameter: "3,031 miles", solar_year: "88 days", distance_from_sun: "36,000,000 miles")
+end
+def venus
+  Planet.new(name: "Venus", type: "Terrestreal", moons: "None", gravity: "8.87 m/s²",
+  diameter: "7,521 miles", solar_year: "224 days", distance_from_sun: "67,000,000 miles")
+  end
+def earth
+  Planet.new( name: "Earth", type: "terrestreal", moons: "Moon", gravity: "9.807 m/s²",
+  diameter: "7,926 miles", solar_year: "365.25 days", distance_from_sun: "92,960,000 miles")
+  end
+def mars
+  Planet.new( name: "Mars", type: "terrestreal", moons: "The moons of Mars are Phobos and Deimos",
+  gravity: "3.711 m/s²", diameter: "4,222 miles", solar_year: "687 days", distance_from_sun: "141,700,000 miles")
+  end
+def jupiter
+  Planet.new(name: "Jupiter", type: "Gas giant",
+  moons: "There are 67 known moons of Jupiter. The most massive of them, the four Galilean moons, were discovered in 1610 by Galileo Galilei are Europa, Ganymede, Io, Callisto, and Amalthea",
+  gravity: "24.79 m/s²", diameter: "88,846 miles", solar_year: "11.86 years", distance_from_sun: "483,500,000 miles")
+    end
+def saturn
+  Planet.new(
+  name: "Saturn", type: "gas giant",
+  moons: "62 moons with confirmed orbits, 53 of which have names and only 13 of which have diameters larger than 50 kilometers. In the other hand, the enormous Titan, which is larger than the planet Mercury",
+  gravity: "10.44 m/s²", diameter: "74,900 miles",solar_year: "29 years",distance_from_sun: "888,750,000 miles")
+  end
+def uranus
+  Planet.new(name: "Uranus", type: "ice giant",
+  moons: "27 known moons, all of which are named after characters from the works of William Shakespeare and Alexander Pope, such as  Miranda, Titania, Oberon, Umbriel, Ariel, Puck, Cupid, and Mab.",
+  gravity: "8.69 m/s²", diameter: "31,763 miles", solar_year: "84 years", distance_from_sun: "1,783,744,300 miles")
+  end
+def neptune
+    Planet.new(name: "Neptune", type: "Ice giant",
+    moons: "14 known moons, which are named for minor water deities in Greek mythology. Triton, Nereid, Larissa, Naiad, Proteus, Thalassa, Galatea, Despina, Psamathe, Laomedeia, Neso, Halimede, Sao, and S/2004 N 1",
+    gravity: "11.15 m/s²", diameter: "30,779 miles", solar_year: "164.8 years", distance_from_sun: "2,797,770,000 miles")
+      end
+def pluto
+  Planet.new(name: "Pluto", type: "dwarf", moons: "five moons down to a detection limit of about 1 km in diameter. In order of distance from Pluto, they are Charon, Styx, Nix, Kerberos, and Hydra.",
+  gravity: "0.658 m/s²", diameter: "1473 miles", solar_year: "248 years", distance_from_sun: "2,756,902,000 to 4,583,190,000 miles")
+  end
+
+case user_planet
+  when "1" || "mercury"
+    result = earth
+  when "2" || "venus"
+ result = venus
+  when "3" || "earth"
+ result = earth
+  when "4" || "secret earth"
+ result = earth
+  when "5" || "mars"
+ result = mars
+  when "6" || "jupiter"
+ result = jupiter
+  when "7" || "saturn"
+ result = saturn
+  when "8" || "uranus"
+ result = uranus
+  when "9" || "neptune"
+ result = neptune
+  when "10" || "pluto"
+ result = pluto
+  when "11" || "planet 9"
+ result = planet_9
+  else
+   "error"
+ end
+
+ puts  "The " + result.type + " planet " + result.name + " has " + result.moons + ". Its gravity is " + result.gravity + "."
+
+class Solar_system
+ attr_accessor  :planets, :formation_year, :distance_from_any_other_planet
+
+ def initialize(the_system)
+   @planets = ["Mercury", "Venus", "Earth", "Secret Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "Pluto", "Planet 9"]
+     @formation_year = the_system[:formation_year]
+     @dist_other= the_system[:dist_other]
+   end
+   def add_planet
+     new_planet do |x|
+       new_planet = x.name
+     @planets << new_planet
+    end
+   end
+end
+
+karlie = Planet.new(name: "Karlie", moons: "3", gravity: "7.8 m/s^2")
+
+
+melissa = Solar_system.new(name: "antena", formation_year: "1989", dist_other: "I don't know yet")
+puts
+puts
+puts melissa.planets
+
+
+# if user_planet == "3" || user_planet == "Earth"
+#   do earth_specs
+#   puts "The" + earth.type + "planet" + earth.name + "has" + earth.moons + ". Its gravity is" + earth.gravity + "."