Comet Leonard, which last passed by Earth 80,000 years ago, has been dazzling the night sky before Christmas, and there's only a few days left to see the celestial object before it disappears forever.

This week will be the only chance to ever observe Comet Leonard — one of the brightest comets to pass by the planet Earth. Comet C/2021 A1 (Leonard) was discovered in January by Astronomer Greg ...