diff --git a/solutions/javascript/space-age/1/space-age.js b/solutions/javascript/space-age/1/space-age.js
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+//
+// This is only a SKELETON file for the 'Space Age' exercise. It's been provided as a
+// convenience to get you started writing code faster.
+//
+
+export const age = (planet, seconds) => {
+  let earthSeconds = 31557600;
+  let planets = {
+      'earth': 31557600,
+      'mercury': earthSeconds * 0.2408467,
+      'venus': earthSeconds * 0.61519726,
+      'mars': earthSeconds * 1.8808158,
+      'jupiter': earthSeconds * 11.862615,
+      'saturn': earthSeconds * 29.447498,
+      'uranus': earthSeconds * 84.016846,
+      'neptune': earthSeconds * 164.79132,
+    };
+  if (!planets.hasOwnProperty(planet)){
+    throw('not a planet')
+  }
+  let years = seconds / planets[planet];
+  return  Number(years.toFixed(2))
+};