Let's make a planetary system!

Breakfast

• Create a Planet class with a name attribute
• Create a SolarSystem class that has an attribute planets that has zero to many Planet instances.
• Get creative! Give each instance of Planet diameters, mass, moons.. whatever! Allow these attributes to be set using a hash in initialize.

Lunch

• Give your solar system a formation year (in earth years).
• Give each planet a rate of solar rotation
• Define a method that returns the local year of the planet based on it's rotation since the beginning of the solar system

Dinner

• Write a program that asks for user input to query the planets:
  • First, ask the user to select a planet they'd like to learn about.
  • Present the user with a list of planets from which they can choose. Something like:
    • 1. Mercury, 2. Venus, 3. Earth, 4. Secret Earth, 5. Mars, 6. Jupiter, ... 13. Exit
  • Provide the user with well formatted information about the planet (diameter, mass, number of moons, primary export, etc.)
  • Then ask the user for another planet.

Dessert

• Give each planet a @distance_from_the_sun attribute, and a method to determine the distance from any other planet (assuming planets are in a stright line from the sun)