Illustration of ATLAS Detector. ATLAS is one of the two general purpose detectors being prepared for the Large Hadron Collider at CERN. The ATLAS experiment will be investigating the behavior of matter, energy, space and time and the smallest distance scales ever probed. Located at the Large Hadron Collider at CERN, the European Organization for Nuclear Physics, near, ATLAS will observe the highest energy proton-proton collisions ever achieved.