The mega-comet hurtling through our solar system is 85, yes 85, miles wide

There are some bona fide behemoths sailing around the solar system. In 2021, astronomers identified a gargantuan comet — an ancient mass of ices, dust, and rocks — hurtling through our cosmic neighborhood. Fortunately, it won't come within a billion miles of Earth. Named Comet Bernardinelli-Bernstein, it was perhaps the largest comet ever detected, likely some 10 times larger than the 6-mile-wide object that pummeled Earth and triggered the dinosaurs' extinction. Now, new research more accur...