A bright visitor

Comet NEOWISE, with its tail, is seen from northwest Denton County between Bolivar and Slidell on Thursday around 10 p.m. It is the brightest comet visible from the Northern Hemisphere in a quarter-century. NASA’s Near-Earth Object Wide-field Infrared Survey Explorer telescope discovered the comet in March. For those hoping to catch a glimpse of the comet before it’s gone, there are several observing opportunities over the coming days when it will become increasingly visible shortly after sunset in the northwest sky. On Wednesday and Thursday, it will pass the closest to Earth, just 64 million miles away. Following its departure, it will not return again for another 6,800 years.