Uranus has 27 moons called Titinania,miranda,umbriel, ariel, trinculio, oberon, puck, cordilia, francisco, ophelia, desdemona, potia, cressida, bianca, belinda, rosalind, juliet, sycorax, cupid, setebos and lots more!!!
Mercury like all other planets mercury obits the sun,it orbit around the only last for 88 days !!!
Mercury dark side is very cold indeed however with temperatures going to -200c or -328 farinhight!!