What is a dwarf planet?
What is a dwarf planet?
user
It is a rocky celestial body that is neither a planet nor a natural satellite, but is large enough to be round and has enough gravity to become spherical.  It has not cleared its orbit of any other objects.  They were first discovered by astronomers in the 1990s.  Since then, more than 80 objects have been found in this category.
assistant
Is a dwarf planet smaller than any of the eight classical planets?
user
That’s correct.
assistant
What are the names of the five best-known dwarf planets?
user