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.

The fate of a comet that was predicted to pass close to Earth remains a mystery five years after its dramatic breakup in the inner solar system.

A fresh analysis of Comet 41P/Tuttle-Giacobini-Kresák observations suggests it abruptly reversed its spin after its last ...