Which organisation declared Pluto a dwarf planet in 2006 ?

Question

Accepted Answer

The International Astronomical Union (IAU) is the internationally recognized authority for assigning designations to celestial bodies and is responsible for naming planetary bodies and their satellites. In 2006, the IAU established a formal definition of a "planet," which Pluto did not meet. Consequently, the IAU reclassified Pluto as a "dwarf planet" at its General Assembly in Prague. Therefore, Option 1 is the correct answer because the IAU is the organization that made this declaration.

Here's why the other options are incorrect:

*   **Option 2: International Geographical Union:** The International Geographical Union (IGU) is concerned with the study of Earth's surface, its physical and human features, and their interactions. It does not have the authority or expertise to define astronomical objects or reclassify planets.

*   **Option 3: American Association of Geography:** The American Association of Geography (AAG) is a scholarly society for geographers in the United States. While it deals with spatial studies, it does not have the international authority to define or classify celestial bodies.

*   **Option 4: Geographical Information System:** A Geographical Information System (GIS) is a system designed to capture, store, manipulate, analyze, manage, and present spatial or geographic data. It is a technology and not an organization that could make decisions about planetary classifications.