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THE ATOM BIREAKS UP
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8-decay a-particle absolute magnitude accelerated amount of energy Andromeda nebula astronomers atmosphere atomic number atomic weights binding energy charged particles chemical cloud collisions cosmic radiation cosmic rays crystal decay diameter discovery disintegration distance earth electron-volts electrons elementary particles elements emission emitted example existence experiment extragalactic fact fission force galaxies globular clusters gravitational helium high energy hydrogen hypothesis interstellar isotope known large number laws light light-years liquid magnetic field mass number matter mesons Milky million molecules motion Mount Wilson nature neutrino neutrons novae nuclear reactions nucleons nucleus nuclides observed obtained occur orbit Palomar Observatories photograph physicists physics planets Plate Population II positron potential problem produced projectiles properties protons quantum radio radioactive radioactive substances reactor regions result solar system solid space spectra spectrum spiral stars stellar structure sun's surface telescope temperature theory thermonuclear tion tritium universe uranium velocity wavelength waves y-rays