foo.diff

diff --git a/js/maps/solar_system.js b/js/maps/solar_system.js
index 2526c9b..1fe224a 100644
--- a/js/maps/solar_system.js
+++ b/js/maps/solar_system.js
@@ -24,6 +24,10 @@ var SolarSystem = function() {
     low_venus_orbit: new Node('Low Venus Orbit'),
     venus: new Node('Venus'),
 
+    mercury_transfer: new Node('Mercuryr Transfer'),
+    low_mercury_orbit: new Node('Low Mercuryr Orbit'),
+    mercury: new Node('Mercuryr'),
+
     mars_transfer: new Node('Mars Transfer'),
     low_mars_orbit: new Node('Low Mars Orbit'),
     mars: new Node('Mars'),
@@ -53,6 +57,10 @@ var SolarSystem = function() {
     venus_transfer_low_venus_orbit: newEdge({ deltav: 2940, name: 'venus_transfer-low_venus_orbit' }),
     low_venus_orbit_venus_landing: newEdge({ deltav: 2000, name: 'low_venus_orbit-venus_landing' }),
 
+    earth_transfer_mercury_transfer: newEdge({ deltav: 2340, name: 'earth_transfer-mercury_transfer' }),
+    mercury_transfer_low_mercury_orbit: newEdge({ deltav: 7530, name: 'mercury_transfer-low_mercury_orbit' }),
+    low_mercury_orbit_mercury_landing: newEdge({ deltav: 3060, name: 'low_mercury_orbit-mercury_landing' }),
+
     earth_transfer_mars_transfer: newEdge({ deltav: 1060, name: 'earth_transfer-mars_transfer' }),
     mars_transfer_low_mars_orbit: newEdge({ deltav: 1440, name: 'mars_transfer-low_mars_orbit' }),
     low_mars_orbit_mars_landing: newEdge({ deltav: 2000, name: 'low_mars_orbit-mars_landing' }),
@@ -92,6 +100,11 @@ SolarSystem.prototype = {
     graph.addEdge(edges.venus_transfer_low_venus_orbit, nodes.venus_transfer, nodes.low_venus_orbit);
     graph.addEdge(edges.low_venus_orbit_venus_landing, nodes.low_venus_orbit, nodes.venus);
 
+    // mercury
+    graph.addEdge(edges.earth_transfer_mercury_transfer, nodes.earth_transfer, nodes.mercury_transfer);
+    graph.addEdge(edges.mercury_transfer_low_mercury_orbit, nodes.mercury_transfer, nodes.low_mercury_orbit);
+    graph.addEdge(edges.low_mercury_orbit_mercury_landing, nodes.low_mercury_orbit, nodes.mercury);
+
     // mars
     graph.addEdge(edges.earth_transfer_mars_transfer, nodes.earth_transfer, nodes.mars_transfer);
     graph.addEdge(edges.mars_transfer_low_mars_orbit, nodes.mars_transfer, nodes.low_mars_orbit);
diff --git a/test/solar_system.js b/test/solar_system.js
index 3e8289a..8f2926a 100644
--- a/test/solar_system.js
+++ b/test/solar_system.js
@@ -74,6 +74,38 @@ describe("one-way trips from earth", function() {
     });
   });
 
+  describe("to mercurian space", function() {
+    it("calculates the delta-v to mercury transfer orbit", function() {
+      var total_value = graph.walk(nodes.earth, nodes.mercury_transfer);
+      var expected_value = edges.low_earth_orbit.value +
+        edges.low_earth_orbit_earth_transfer.value +
+        edges.earth_transfer_mercury_transfer.value;
+
+      expect(total_value).to.equal(expected_value);
+    });
+
+    it("calculates the delta-v to low mercury orbit", function() {
+      var total_value = graph.walk(nodes.earth, nodes.low_mercury_orbit);
+      var expected_value = edges.low_earth_orbit.value +
+        edges.low_earth_orbit_earth_transfer.value +
+        edges.earth_transfer_mercury_transfer.value +
+        edges.mercury_transfer_low_mercury_orbit.value;
+
+      expect(total_value).to.equal(expected_value);
+    });
+
+    it("calculates the delta-v to a mercury landing", function() {
+      var total_value = graph.walk(nodes.earth, nodes.mercury);
+      var expected_value = edges.low_earth_orbit.value +
+        edges.low_earth_orbit_earth_transfer.value +
+        edges.earth_transfer_mercury_transfer.value +
+        edges.mercury_transfer_low_mercury_orbit.value +
+        edges.low_mercury_orbit_mercury_landing.value;
+
+      expect(total_value).to.equal(expected_value);
+    });
+  });
+
   describe("to martian space", function() {
     it("calculates the delta-v to mars transfer orbit", function() {
       var total_value = graph.walk(nodes.earth, nodes.mars_transfer);