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the definition of planet warning this is not an official definition merely a proposal the definition a planet in our solar system is an object gravitationally bound to the sun which has the same diameter as pluto or a larger diameter the planets mercury venus earth and luna the moon mars jupiter ganymede io callisto europa saturn titan uranus neptune triton pluto xena as we know it should be called why can t a planet be a warrior princess i have checked this and i believe i have the correct list of bodies and moreover that the list remains the same if diameter is replaced by mass unless xena is paradoxically lighter than pluto which i have not checked advantages of this definition it is readily checked by observation and it is likely to be stable the modifications of textbooks that it entails are virtuous it is good for students to know at least the galilean satellites of jupiter and the largest moons of the other outer planets no object which is a planet under the old definition ceases to be a planet disadvantages of other definitions the newest definition is open to challenge on the grounds that it is unclear that the classical planets have really all cleared their orbits in any precise sense there are plenty of asteroids that cross the orbits of earth and mars and pluto crosses the orbit of neptune the other definition proposed in the iau is perverse in making charon a planet without making luna our moon a planet and likely to be unstable in that numerous asteroids and large kuiper belt objects become debatable cases the textbooks will constantly be adjusted a question should it be mass rather than diameter mass may be more easily observable does it give a different class of objects there seems not to be an object with smaller diameter than pluto which is more massive it appears that xena is heavier than pluto the boring alternative my sons pointed out as i knew perfectly well of course that adding the additional clause that a planet should not be gravitationally bound to anything larger than itself other than the sun neatly restricts us to the familiar planets and xena but i ve always thought ever since learning that ganymede has a larger diameter than mercury when i was a child that the major satellites are worlds in their own right