Dwarf planet to gradually become tidally locked, such that it always presents the same face to its companion. An extreme example of this is the Pluto–Charon system, where both bodies are tidally locked to each other. Earth's Moon is also tidally locked, as are many satellites of the gas giants. The upper and lower size and mass limits of dwarf planets have not been specified by the IAU. There is no defined upper limit, and an object larger or more massive than Mercury that has not "cleared the neighbourhood around its orbit" would be classified as a dwarf planet. The lower limit
The Adventures of Pluto Nash Dina suggests that the initials are in fact "MZM", having been seen upside-down by Mona Zimmer. Pluto searches for "MZM" and discovers a criminal called Michael Zoroaster Marucci (Alec Baldwin). Pluto suspects that Michael Marucci and Rex Crater are one and the same. Abruptly, he is contacted by his mother, who tells him that Rowland has been killed by a fellow police officer and the hideout is attacked by Rex Crater's agents. A chase ensues and the heroes escape, but their car is damaged and explodes, causing them to be presumed dead by the agents. They manage to get out