The static extension

extension.js

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+const Main = imports.ui.main;
+const PanelMenu = imports.ui.panelMenu;
+const St = imports.gi.St;
+const Clutter = imports.gi.Clutter;
+
+function PlanetsExtension(extensionMeta) {
+    this._init(extensionMeta);
+}
+
+PlanetsExtension.prototype = {
+    __proto__: PanelMenu.Button.prototype,
+
+    _init: function(extensionMeta) {
+        PanelMenu.Button.prototype._init.call(this, 0.0);
+
+        this.extensionMeta = extensionMeta;
+
+        this.panelContainer = new St.BoxLayout({style_class: "panel-box"});
+        this.actor.add_actor(this.panelContainer);
+        this.actor.add_style_class_name('panel-status-button');
+
+        this.panelLabel = new St.Label({
+            text: 'Planets init…',
+            y_align: Clutter.ActorAlign.CENTER
+        });
+        this.panelContainer.add(this.panelLabel);
+    }
+};
+
+function ExtensionController(extensionMeta) {
+    return {
+        extensionMeta: extensionMeta,
+        extension: null,
+
+        enable: function() {
+            this.extension = new PlanetsExtension(this.extensionMeta);
+
+            Main.panel.addToStatusArea("planets", this.extension, 0, "right");
+        },
+
+        disable: function() {
+            this.extension.actor.destroy();
+            this.extension.destroy();
+
+            this.extension = null;
+        }
+    };
+}
+
+function init(extensionMeta) {
+    // Do whatever it takes to initialize your extension, like
+    // initializing the translations. However, never do any widget
+    // magic here.
+
+    // Then return the controller object
+    return new ExtensionController(extensionMeta);
+}

metadata.json

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+{
+    "shell-version": [
+        "3.10"
+    ],
+    "uuid": "planets@gergely.polonkai.eu",
+    "name": "Planets",
+    "description": "Display planets position"
+}