http://www.newsweek.com/largest-comet-ever-approach-sun-objects-solar-system-space-1634213

A near 100 mile-wide comet from the outer edges of the solar system is headed toward the sun and the inner solar system where Earth dwells.

At an estimated 93 miles wide, the Bernardinelli-Bernstein Comet is believed to be the largest comet ever discovered. It will make a close approach to Saturn's orbit in a decade.