A year on Pluto is equivalent to two hundred and forty-eight Earth years.
Why it is true
Due to its enormous distance from the Sun and its elliptical orbit, the dwarf planet moves very slowly, taking over two and a half centuries to complete a single orbit around our star.
Source: Orbital Mechanics
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.