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buy bupron sr Professor Thomas Robinson of Western Nebraska Community College said, ???Comet ISON is brightening now. If the comet continues to brighten steadily, it means it will most likely survive its encounter with the sun and could become a spectacular sight for us in early December. If however, it brightens significantly over the next few days, it could be breaking up due to the stresses of the sun???s gravitational pull. We should know more by the end of the week.???