We are trying to learn more about comets to see what the first materials were like or how water arrived on Earth. It's important because all the atoms in our bodies were formed from the stars.
It seems that comets are...a mixture of materials formed at all temperatures, at places very near the early sun and at places very remote from it.
That's a big surprise. People thought comets would just be cold stuff that formed out ... where things are very cold. It was kind of a shock to not just find one but several of these, which implies they are pretty common in the comet.