 The proposed redefinition was criticised as ambiguous: Astronomer Phil Plait and NCSE writer Nick Matzke both wrote about why they thought the redefinition was not, in general, a good one. It defined a planet as orbiting a star, which would have meant that any planet ejected from its star system or formed outside of one (a rogue planet) could not have been called a planet, even if it fit all other definitions. A similar situation already applied to the term 'moon', such bodies ceasing to be moons on being ejected from planetary orbit; this usage had widespread acceptance. Similarly, the redefinition did not differentiate between planets and brown dwarf stars. Any attempt to clarify this differentiation was to be left until a later date.
