Question

Which planet was downgraded to a dwarf planet in 2006?

Answer 1

Pluto was downgraded to a dwarf planet in 2006. It had previously been considered a planet since its discovery in 1930, but in 2006 the International Astronomical Union (IAU) reclassified it as a dwarf planet. This decision was controversial at the time, but has since been accepted by the scientific community.

Answer 2

The planet that downgraded to a dwarf planet in 2006 is Pluto. In August 2006, the International Astronomical Union (IAU) established new guidelines for classifying planets and Pluto was reclassified as a dwarf planet.

Answer 3

The planet that was downgraded to a dwarf planet in 2006 is Pluto. It was reclassified by the International Astronomical Union (IAU) as a "dwarf planet" due to the discovery of several other objects in the area of space occupied by Pluto, which led astronomers to question whether it should be considered a planet in the first place.

Answer 4

The planet that was downgraded to a dwarf planet in 2006 is Pluto. Prior to 2006, Pluto was considered the ninth planet of our solar system. However, during the 26th General Assembly of the International Astronomical Union (IAU) held in Prague, Czech Republic, a new definition for a planet was adopted, which led to Pluto's reclassification. According to the IAU definition, a planet must meet three criteria: it must orbit the Sun, it must be spherical in shape, and it must have cleared its orbit of other debris. Since Pluto did not meet the third criterion, it was reclassified as a dwarf planet.