On a mountain top in the foothills of the Andes in northern Chile a new kind telescope, the LSST, is under construction. It's unique design allows it to image an area of the sky 40 times the size of the full moon and thus record the entire sky twice a week. In 30 seconds the LSST can spot objects 10 million times fainter than we can see with our eyes. It will discover objects which change in brightness and position to enable astronomers to study dark energy, weird stars, Earth approaching objects, and other fascinating time dependent events in the Universe.