Not only is this comet a monster, it makes a giant mockery of the Standard Model of Physics.
They imagine this is a dirty snowball from the “Oort Cloud” - an invented magical place that produces unlimited giant snowballs and throws them at the Sun for no apparent reason, while remaining invisible to space telescopes at all wavelengths.
This comet, detected near Neptune (likely where it was actually emitted from) is about 136 kilometres in diameter (larger than many moons) and is already outgassing a tail.
I patiently await the physicist who can explain how a giant snowball can sublimate and outgas a giant tail of matter when it’s temperature cannot be much higher than -270 degrees Celsius (-450 Fahrenheit).
And we had all better hope that it keeps well away from Earth!