In 'Don't Look Up,' a pair of scientists struggle to convince America (and the President) that a comet is on course to destroy the Earth. It's not so farfetched.

Researchers got an up-close look at the largest comet ever observed, C/2014 UN271, hurtling toward the sun from the Oort Cloud and measuring 85 miles across with jets of carbon monoxide gas.

Comet has been floating through space for billions of years before being years before being photographed by UAE observatory ...

For as long as I remember there have been frequent forecasts of bright comets coming to our skies. Often, many predictions go way over the top, like “Comet of the Century will Light up the Sky.” ...

Comet Tsuchinshan-Atlas shows great promise, though. Calling it the comet of the century is a bit much since, for one thing, there are more than 75 years left of the present century.