Skywatchers are being urged to mark their calendars as a newly tracked comet is set to make a relatively close pass by Earth in April, offering a potential viewing opportunity for those with the right equipment. According to NASA ’s April skywatching guidance, Comet C/2025 R3 will reach its closest approach to Earth on April 27, when it comes within about 44 million miles of the planet . The comet is expected to be visible in the predawn sky for observers in the Northern Hemisphere through much