We've seen things you people wouldn't believe. Mega-comets lurking in solar systems, spewing carbon monoxide

Comet BB is not only largest of its type that we know of, it was likely active billions of miles from the Sun

Not only is comet Bernardinelli-Bernstein the largest of its kind known, it’s also one of the most active, distant comets, likely spewing plumes of gas further out from the Sun than expected.…

from The Register