Match the definition to the correct astronomical term. Prompt 1a model in which the density of the universe is not high enough to bring the expansion of the universe to a halt Answer for prompt 1 a model in which the density of the universe is not high enough to bring the expansion of the universe to a halt Prompt 2microwave radiation coming from all directions that is the redshifted afterglow of the Big Bang Answer for prompt 2 microwave radiation coming from all directions that is the redshifted afterglow of the Big Bang Prompt 3the study of the organization and evolution of the universe Answer for prompt 3 the study of the organization and evolution of the universe Prompt 4a model in which the universe expands from a Big Bang, stops, and then contracts to a big crunch Answer for prompt 4 a model in which the universe expands from a Big Bang, stops, and then contracts to a big crunch Prompt 5the speculative idea that our universe is just one of many universes, each with its own set of physical laws Answer for prompt 5 the speculative idea that our universe is just one of many universes, each with its own set of physical laws Prompt 6the theory of cosmology in which the expansion of the universe began with a primeval explosion Answer for prompt 6 the theory of cosmology in which the expansion of the universe began with a primeval explosion Prompt 7a model of the universe that has a critical density and in which the geometry of the universe is flat, like a sheet of paper Answer for prompt 7 a model of the universe that has a critical density and in which the geometry of the universe is flat, like a sheet of paper Prompt 8a theory of cosmology in which the universe is assumed to have undergone a phase of very rapid expansion when the universe was about 10^-35 second old