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activity antimatter appear arrangement astronomers atomic nucleus atoms become behaviour big bang billion years ago biological black hole catastrophe centre chemical collapse communities complex computers core cosmic cosmos creation density detect deuterium distant dwarf Earth effect electrons emitted energy entropy epochs equilibrium event horizon eventually evolution example existence extraterrestrial fate force galactic galaxies gravitons gravity happens heat helium helium flash human hundred hydrogen idea inside intelligent interstellar known law of thermodynamics light machine mass material matter Milky molecules motion nature nebula neutrinos neutron star nuclear nucleus objects observer occur orbit organization particles perhaps physicists planet plasma possible present primeval fireball principle produced protons quantity quantum radiation radio random receding recontraction red giant region rotating Schwarzschild radius scientists second law singularity slowly solar system space space-time speed spin structure supernova surface telescopes temperature theory thousand tion universe white dwarf