As for Comet US10, this is your last chance. It won’t be back for millions of years. NASA is posting photos of the flyby. See one from December 12 at http://apod.nasa.gov/apod/ap151212.html/ It's not as bright as we might have hoped, but it's thought that US10's tails are HALF a million miles long.
Here's another way to learn more about comets -- try out this fun kitchen comet activity from science author Mary Kay Carson!