Since 2006, Pluto has been considered a dwarf planet.
the only planet that scientists do not consider a planet is Pluto, (but they also found new planets in the asteroid belt.)Pluto
Pluto, but some consider that Pluto is not a planet anymore.
August 24, 2006 is the date when Pluto was consider no more a planet.
no
2006
A VERY small planet.
Mercury, Mars and Pluto if you consider Pluto as a planet.
Ceres, Pluto, Haumea, Makemake and Eris.
Charon. It's more of a satellite than a planet, unless you want to consider Pluto/Charon as a double planet. That's a little awkward, since Pluto has been downgraded to a planetoid.
Pluto. It is now considered a "Dwarf Planet", due to its tiny size and the fact that there are other bodies like Pluto in the outer Solar System.
Because it is not big enough. It is classed as a dwarf planet.
Pluto didn't change; our ideas of Pluto did. It turns out that Pluto is smaller than originally believed, so eventually he was "demoted" to the status (newly-created) of a "dwarf planet". It is unlikely that he will oficially be declared (by the IAU) a planet again.