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+# Space Age
+
+Welcome to Space Age on Exercism's Python Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+The year is 2525 and you've just embarked on a journey to visit all planets in the Solar System (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune).
+The first stop is Mercury, where customs require you to fill out a form (bureaucracy is apparently _not_ Earth-specific).
+As you hand over the form to the customs officer, they scrutinize it and frown.
+"Do you _really_ expect me to believe you're just 50 years old?
+You must be closer to 200 years old!"
+
+Amused, you wait for the customs officer to start laughing, but they appear to be dead serious.
+You realize that you've entered your age in _Earth years_, but the officer expected it in _Mercury years_!
+As Mercury's orbital period around the sun is significantly shorter than Earth, you're actually a lot older in Mercury years.
+After some quick calculations, you're able to provide your age in Mercury Years.
+The customs officer smiles, satisfied, and waves you through.
+You make a mental note to pre-calculate your planet-specific age _before_ future customs checks, to avoid such mix-ups.
+
+~~~~exercism/note
+If you're wondering why Pluto didn't make the cut, go watch [this YouTube video][pluto-video].
+
+[pluto-video]: https://www.youtube.com/watch?v=Z_2gbGXzFbs
+~~~~
+
+## Instructions
+
+Given an age in seconds, calculate how old someone would be on a planet in our Solar System.
+
+One Earth year equals 365.25 Earth days, or 31,557,600 seconds.
+If you were told someone was 1,000,000,000 seconds old, their age would be 31.69 Earth-years.
+
+For the other planets, you have to account for their orbital period in Earth Years:
+
+| Planet  | Orbital period in Earth Years |
+| ------- | ----------------------------- |
+| Mercury | 0.2408467                     |
+| Venus   | 0.61519726                    |
+| Earth   | 1.0                           |
+| Mars    | 1.8808158                     |
+| Jupiter | 11.862615                     |
+| Saturn  | 29.447498                     |
+| Uranus  | 84.016846                     |
+| Neptune | 164.79132                     |
+
+~~~~exercism/note
+The actual length of one complete orbit of the Earth around the sun is closer to 365.256 days (1 sidereal year).
+The Gregorian calendar has, on average, 365.2425 days.
+While not entirely accurate, 365.25 is the value used in this exercise.
+See [Year on Wikipedia][year] for more ways to measure a year.
+
+[year]: https://en.wikipedia.org/wiki/Year#Summary
+~~~~
+
+For the Python track, this exercise asks you to create a `SpaceAge` _class_ (_[concept:python/classes]()_) that includes methods for all the planets of the solar system.
+Methods should follow the naming convention `on_<planet name>`.
+
+Each method should `return` the age (_"on" that planet_) in years, rounded to two decimal places:
+
+```python
+#creating an instance with one billion seconds, and calling .on_earth().
+>>> SpaceAge(1000000000).on_earth()
+
+#This is one billion seconds on Earth in years
+31.69
+```
+
+For more information on constructing and using classes, see:
+
+-   [**A First Look at Classes**][first look at classes] from the Python documentation.
+-   [**A Word About names and Objects**][names and objects] from the Python documentation.
+-   [**Objects, values, and types**][objects, values and types] in the Python data model documentation.
+-   [**What is a Class?**][what is a class] from Trey Hunners Python Morsels website.
+
+[first look at classes]: https://docs.python.org/3/tutorial/classes.html#a-first-look-at-classes
+[names and objects]: https://docs.python.org/3/tutorial/classes.html#a-word-about-names-and-objects
+[objects, values and types]: https://docs.python.org/3/reference/datamodel.html#objects-values-and-types
+[what is a class]: https://www.pythonmorsels.com/what-is-a-class/
+
+## Source
+
+### Contributed to by
+
+- @abhijitparida
+- @behrtam
+- @cmccandless
+- @crsmi
+- @Dog
+- @gabriel376
+- @gabriellhrn
+- @ikhadykin
+- @kytrinyx
+- @lowks
+- @N-Parsons
+- @pheanex
+- @sjakobi
+- @tqa236
+- @AndrewLawendy
+
+### Based on
+
+Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial. - https://pine.fm/LearnToProgram/?Chapter=01