The solar system is much more complicated now, astronomers say, than in 1930 when Clyde Tombaugh added Pluto to the inventory of wandering lights circling the Sun.

Choose your answer: based on the paragraph above can we conclude that "pluto moved closer to the sun"?

Possible answers:
 * Yes.
 * It's impossible to say.
 * No.
I think the answer is
It's impossible to say