When was Pluto classified as a dwarf planet?

Answer 1

Pluto was re-classified as a dwarf planet on August 24th 2006 by the International Astronomical Union (IAU). A new definition for a planet was established, Pluto did not fit the new criteria, so was deemed a dwarf planet - known to be spherical in shape and orbit the sun directly, but not dominating its orbit like all 8 remaining planets.

Answer 2

On the 24th of August 2006. Pluto is not in the solar system anymore. So now there are 8 planets in the Solar System.

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I think it's still considered as being in the solar system. It was simply demoted.

Answer 3

The controversial "redefinition" of Pluto was done in August 2006, but it is not likely to stand. Only four percent of the IAU voted on the controversial demotion, and most are not planetary scientists. Their decision was immediately opposed in a formal petition by hundreds of professional astronomers led by Dr. Alan Stern, Principal Investigator of NASA's New Horizons mission to Pluto. One reason the IAU definition makes no sense is it says dwarf planets are not planets at all! That is like saying a grizzly bear is not a bear, and it is inconsistent with the use of the term "dwarf" in astronomy, where dwarf stars are still stars, and dwarf galaxies are still galaxies. Also, the IAU definition classifies objects solely by where they are while ignoring what they are. If Earth were in Pluto's orbit, according to the IAU definition, it would not be a planet either. A definition that takes the same object and makes it a planet in one location and not a planet in another is essentially useless. Pluto is a planet because it is spherical, meaning it is large enough to be pulled into a round shape by its own gravity--a state known as hydrostatic equilibrium and characteristic of planets, not of shapeless asteroids held together by chemical bonds. These reasons are why many astronomers, lay people, and educators are either ignoring the demotion entirely or working to get it overturned.

Answer 4

Pluto was declared a dwarf planet in 2006.

Answer 5

Pluto has been considered a dwarf planet since 2006.

Answer 6

Pluto became classified as a dwarf planet in 2006, specifically on August 24.

Answer 7

Pluto was was designated as dwarf plant in 2006 by the Internationale astronomical union

Answer 8

Pluto was named a dwarf planet 2005

Answer 9

2006