diff --git a/game.js b/game.js
index c40cb33..6e197ec 100644
--- a/game.js
+++ b/game.js
@@ -3426,6 +3426,10 @@ dojo.declare("com.nuclearunicorn.game.ui.GamePage", null, {
            "paragon": paragonPoints
        };

+        if (this.challenges.currentChallenge == "blackSky") {
+            addRes["ship"] = 1
+        }
+
        var karmaZebras = parseInt(this.karmaZebras);   //hack
        //that's all folks

diff --git a/js/calendar.js b/js/calendar.js
index eeb003b..63503a3 100644
--- a/js/calendar.js
+++ b/js/calendar.js
@@ -446,7 +446,8 @@ dojo.declare("com.nuclearunicorn.game.Calendar", null, {
        //------------------------- astronomical events -------------------------
        if (this.game.bld.get("library").on > 0) {
            var eventChance = (0.0025 + this.game.getEffect("starEventChance")) * chanceRatio;
-           if (this.game.prestige.getPerk("astromancy").researched) {
+
+            if (this.game.prestige.getPerk("astromancy").researched) {
                eventChance *= 2;
            }

@@ -455,10 +456,14 @@ dojo.declare("com.nuclearunicorn.game.Calendar", null, {
                    this.observeTimeout();
                }

+
+                if (this.game.challenges.currentChallenge == "blackSky") {
+                    this.game.msg("The night is dark, no stars to observe.", "astronomicalEvent");
+
                //---------------- SETI hack-------------------
                if (this.game.workshop.get("seti").researched) {
                    this.observeHandler();
-               } else {
+                }  else {
                    this.observeClear();
                    this.game.msg($I("calendar.msg.event"), "", "astronomicalEvent");
                    var node = dojo.byId("observeButton");
@@ -818,7 +823,13 @@ dojo.declare("com.nuclearunicorn.game.Calendar", null, {
        }

        var pyramidVal = this.game.religion.getZU("blackPyramid").val;
-       var markerVal = this.game.religion.getZU("marker").val;
+        var markerVal = this.game.religion.getZU("marker").val;
+
+        if (this.game.challenges.getChallenge("blackSky").researched) {
+            pyramidVal += 1
+            markerVal *= 1.1
+        }
+
        if ( pyramidVal > 0 ){
            if (this.game.rand(1000) < 35 * pyramidVal * (1 + 0.1 * markerVal)){   //3.5% per year per BP, x10% per marker
                this.game.diplomacy.unlockElders();
diff --git a/js/challenges.js b/js/challenges.js
index 2c66b92..89bb9e7 100644
--- a/js/challenges.js
+++ b/js/challenges.js
@@ -51,7 +51,14 @@ dojo.declare("classes.managers.ChallengesManager", com.nuclearunicorn.core.TabMa
        effectDesc: $I("challendge.1000Years.effect.desc"),
         researched: false,
         unlocked: false
-   }],
+   },{
+       name: "blackSky",
+       label: "Black Sky",
+       description: "Restart the game with no astronomical events to observe.<br/><br/>Goal: build one Space Beacon.",
+       effectDesc: "elders comes early",
+        researched: false,
+        unlocked: false
+    }],

    game: null,

@@ -106,8 +113,12 @@ dojo.declare("classes.managers.ChallengesManager", com.nuclearunicorn.core.TabMa
            if (this.game.bld.get("aiCore").val > 0){
                this.researchChallenge("anarchy");
            }
+       } else if (this.currentChallenge == "blackSky") {
+           if (this.game.space.getBuilding('spaceBeacon').val > 0){
+               this.researchChallenge("blackSky");
+           }
+        }

-       }
        // winterIsComing
        if (this.currentChallenge == "winterIsComing") {
            if (this.game.space.getPlanet("helios").reached){
diff --git a/js/diplomacy.js b/js/diplomacy.js
index bd74954..24278e7 100644
--- a/js/diplomacy.js
+++ b/js/diplomacy.js
@@ -326,6 +326,10 @@ dojo.declare("classes.managers.DiplomacyManager", null, {

     onNewDay: function(){
         var elders = this.get("leviathans");
+        if (elders.unlocked) {
+            this.game.challenges.getChallenge("blackSky").unlocked = true;
+        }
+
         if (elders.duration <= 0  && elders.unlocked){
            elders.unlocked = false;
            this.game.msg($I("trade.msg.elders.departed"), "notice");
diff --git a/js/space.js b/js/space.js
index cee2816..508fe82 100644
--- a/js/space.js
+++ b/js/space.js
@@ -1152,6 +1152,13 @@ dojo.declare("com.nuclearunicorn.game.ui.SpaceProgramBtnController", com.nuclear
                 var reductionRatio = this.game.getHyperbolicEffect(this.game.getEffect("oilReductionRatio"), 0.75);
                 prices[i].val *= (1 - reductionRatio);
             }
+
+            if (this.game.challenges.currentChallenge == "blackSky"
+                && model.metadata.name == "orbitalLaunch"
+                && prices[i].name == "starchart") {
+                prices[i].val = 0
+            }
+
         }

         return prices;
@@ -1232,6 +1239,13 @@ dojo.declare("classes.ui.space.PlanetBuildingBtnController", com.nuclearunicorn.
                 var reductionRatio = this.game.getHyperbolicEffect(this.game.getEffect("oilReductionRatio"), 0.75);
                 prices[i].val *= (1 - reductionRatio);
              }
+
+            if (this.game.challenges.currentChallenge == "blackSky"
+                && meta.name == "sattelite"
+                && meta.val == 0
+                && prices[i].name == "starchart") {
+                prices[i].val = 0
+            }
         }

         return prices;