Research 1 on Google earth

Thing can be on google earth

Create 3d model on google earth by using sketchup

Google Earth can be develop using Java Gwt API for Google Map

The Google Maps API provides a convenient JavaScript API which allows you to add mapping functionality to your application. The Google Maps library for GWT allows you to access this JavaScript API from Java code compiled with the GWT compiler.

Documentation for GWT Google Map

KML in Google Earth

KML is a file format used to display geographic data in an Earth browser, such as Google Earth, Google Maps, and Google Maps for mobile. You can create KML files to pinpoint locations, add image overlays, and expose rich data in new ways. KML is an international standard maintained by the Open Geospatial Consortium, Inc. (OGC).

KML Interactive Sampler You can see what can be done in google earth