The physicist J. J. Thompson discovered electrons, the smallest known elementary particle until the advent of quantum physics, in 1897. He used a cathode ray tube to "detect" the presence of electrons but no microscope exists which can see the subatomic particles like proton, electron or neutron. All these subatomic particles make up an atom. The atom is million times smaller the thickest human hair. Quantum physics has further discovered subatomic particles such as quark, lepton and gauge bosons. Scientists are using a Large Hadron Collider at a cost of $9 billion, with a diameter of twenty seven kilometers; it is a particle accelerator which uses electric fields to propel subatomic particles at very high speeds so as to collide such beams of particles with an intend to study smaller particles formed as a result of the collision. But no scientist would ever see any subatomic particle with his or her naked eye. The scientists consider universe to be very large and of infini...
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