What object officially joined our solar system on 1st May 1930?
what object officially joined our solar system on 1st may 1930
FreebaseQA-train-17275.P0 FreebaseQA-train-17275.P1
solar system solar system
solar system solar system
m.06p5g m.06p5g
astronomy.star_system.dwarf_planets astronomy.star_system.planetary_system
m.0c3qy
pluto
m.0c3qy
pluto