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The term exascale computing is used for computing on the scale of exaFLOPs, i.e., a quintillion FLOPs, or 1018 floating point arithmetic operations performed per second, specifically the ability to dedicate such a capability to a single task, model, simulation, or calculation. As of 2019, exascale capability is one-to-two orders-of-magnitude more than that of current top facilities and is a specific goal pursued by the larger technically-capable countries, for use in future scientific analysis as well as engineering efforts. Target dates of various efforts to achieve the capability are generally around 2020-2023. The capability will make three dimensional models practical in more areas of scientific analysis, including core collapse supernova models and other astrophysical phenomena.