ALICE or A Large Ion Collider Experiment studies heavy ion collisions (heavier than helium) or extremely hot nuclear matter or high-energy physics. It has 6 cylindrical layers of silicon tracking systems that measure the properties emerging particles. It has a Time Projection Chamber that ionize gas atoms along the path. The transition radiation detector to find out electrons and positrons. All charged particles are identifed by the time of flight. Photon spectrometer to measure temperature of collisions, High Momentum Particle Identification Detector to determine the speed of particles, muon spectrometer to measure pairs of muons, Forward Multiplicity Detector to measure charged particles emitted at small angles, Electro Magnetic Calorimeter to measure high momentum particles.