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The properties of matter
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000 million acceleration accurately alpha particles astronomers atomic mass units balance Big Bang body bubble chamber Cavendish Cavendish experiment centre CERN charged particles chemical copper cube cubic centimetre density diameter distance Earth electron volts elements equal ether experiment explosion force of attraction fundamental matter stuff galaxies grammes gravitational heat helium high energy isotopes Kepler kilogramme kilometres kilometres per hour kind known krypton 86 lead ball liquid machines magnetic field measure the mass measuring mass ments mesons metre million electron volts molecules Moon motion moving National Physical Laboratory needed neutrons nuclear nucleons nucleus number of protons observed orbiting electrons physicists planets plasma Plate platinum pound pressure properties of matter proton synchrotron protons and neutrons radiation scientists sheet shown small ball Solar System space speed of light stars substance surface telescope temperature thickness things tiny tonne tracks universe uranium vapour velocity of light wavelength weight