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+# Space Age
+
+Welcome to Space Age on Exercism's Rust Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given an age in seconds, calculate how old someone would be on:
+
+   - Mercury: orbital period 0.2408467 Earth years
+   - Venus: orbital period 0.61519726 Earth years
+   - Earth: orbital period 1.0 Earth years, 365.25 Earth days, or 31557600 seconds
+   - Mars: orbital period 1.8808158 Earth years
+   - Jupiter: orbital period 11.862615 Earth years
+   - Saturn: orbital period 29.447498 Earth years
+   - Uranus: orbital period 84.016846 Earth years
+   - Neptune: orbital period 164.79132 Earth years
+
+So if you were told someone were 1,000,000,000 seconds old, you should
+be able to say that they're 31.69 Earth-years old.
+
+If you're wondering why Pluto didn't make the cut, go watch [this
+youtube video](http://www.youtube.com/watch?v=Z_2gbGXzFbs).
+
+Some Rust topics you may want to read about while solving this problem:
+
+- Traits, both the From trait and implementing your own traits
+- Default method implementations for traits
+- Macros, the use of a macro could reduce boilerplate and increase readability 
+  for this exercise. For instance, 
+  [a macro can implement a trait for multiple types at once](https://stackoverflow.com/questions/39150216/implementing-a-trait-for-multiple-types-at-once),
+  though it is fine to implement `years_during` in the Planet trait itself. A macro could
+  define both the structs and their implementations. Info to get started with macros can 
+  be found at:
+  
+  - [The Macros chapter in The Rust Programming Language](https://doc.rust-lang.org/stable/book/ch19-06-macros.html)
+  - [an older version of the Macros chapter with helpful detail](https://doc.rust-lang.org/1.30.0/book/first-edition/macros.html)
+  - [Rust By Example](https://doc.rust-lang.org/stable/rust-by-example/macros.html)
+
+## Source
+
+### Created by
+
+- @IanWhitney
+
+### Contributed to by
+
+- @ashleygwilliams
+- @bobahop
+- @coriolinus
+- @cwhakes
+- @durka
+- @eddyp
+- @efx
+- @ErikSchierboom
+- @IanWhitney
+- @joshgoebel
+- @lutostag
+- @nfiles
+- @ocstl
+- @petertseng
+- @rofrol
+- @stringparser
+- @xakon
+- @ZapAnton
+
+### Based on
+
+Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial. - http://pine.fm/LearnToProgram/?Chapter=01
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