It is now increasingly hard to justify calling Pluto a planet if UB313 is not also given this status.

Since UB313 is decidedly larger than Pluto, it is now increasingly hard to justify calling Pluto a planet if UB313 is not also given this status.

Since UB 313 is decidedly larger than Pluto, it is now increasingly hard to justify calling Pluto a planet if UB 313 is not also given this status.

It would be impolite to Pluto to degrade it to something less.

There's good evidence that it's definitely larger, by quite a bit, than Pluto.

I think the new discoveries are going to indicate that Pluto should not really be called a planet.