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