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THE ATOM BREAKS UP
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a-particle absolute magnitude accelerated Andromeda nebula astronomers atmosphere atomic number atomic weights attraction beam behaviour binding energy centimetre centre charged particles chemical cloud clusters collisions cosmic radiation cosmic rays crystal diameter direction discovery disintegration distance earth Einstein electric charge electron-volts electrons elementary particles elements emission emitted example existence experiment extragalactic fact fission force galaxies gravitational helium high energy hydrogen hypothesis interstellar isotopes known large number laws light light-years magnetic field mass number mathematical matter mesons Milky million molecules motion Mount Wilson nature negative neutrino novae nuclear reactions nucleons nucleus observed obtained occur orbit Palomar Observatories photograph physicists physics planets Plate positron potential barrier problem produced projectiles protons quantum radioactive radioactive isotopes radioactive substances Radium result scale sodium solar system solid space spectrum spiral stars stellar structure sun's supernova surface telescope temperature theory tion tritium universe uranium velocity wavelength waves y-rays