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.

31/Atlas Comet LIVE Tracker: 3I/ATLAS is believed to be 7 billion years old, meaning it is likely twice as old as the Earth itself. NASA has confirmed that the comet will swing just inside Mars’ orbit ...