INDIANA JONES, it is fair to say, would not approve. A small band of archaeologists are using Google Earth to make discoveries without getting their hands dirty. Although archaeologists have used satellite imagery for decades, the technique remained out of reach of most researchers because of the prohibitive costs and specialist skills needed to rectify distortions in raw satellite images caused by the angle of capture. But Google Earth, a free program that can be downloaded from the internet giant’s website, makes high-quality satellite images of much of the world’s surface available to anyone with a broadband connection. Archaeologists are now embracing the technology.