Comet C/2023 A3 (Tsuchinshan–Atlas), unseen since Neanderthal times, has reappeared and may be visible to the naked eye. Discovered last year, it orbits the sun every 80,000 years and originates from the Oort cloud. Dr. Gregory Brown from the Royal Observatory Greenwich notes its closest approach to Earth will be around October 13, with optimal viewing a few days before and after. The comet could be one of the brightest in decades, though its exact brightness remains uncertain.