from astronomers. The IAU has stated that there are eight known planets in the Solar System. It has been argued that the definition is problematic because...

Source: "IAU 2006 General Assembly: Resolutions 5 and 6" (PDF). IAU. August 24, 2006. Retrieved June 23, 2009. The definition of the term planet has changed...

Charon be reclassified as a double planet, but the proposal was abandoned in favor of the current IAU definition of planet. Other trans-Neptunian systems...

the IAU. Alan Stern, the director of NASA's mission to Pluto, rejects the current IAU definition of planet, both in terms of defining dwarf planets as...

formal definition of a planet that was proposed by the International Astronomical Union (IAU) in August 2006. According to IAU definition of planet, a planet...

A pluton is a body of intrusive igneous rock. Pluton may also refer to: A proposed IAU definition of planet rejected in favour of plutoid French ship...

Twelfth planet may refer to: The 12th Planet, a pseudoscience book by Zecharia Sitchin 12th Planet (musician), an American dubstep producer and DJ IAU definition...

System. Under the IAU definition, true or "major planets" can be distinguished from other planetary-mass objects (PMOs), such as dwarf planets and sub-brown...

are eight official planets in the Solar System per the International Astronomical Union (IAU), which has also established a definition for exoplanets. Several...

number of dwarf planets may be much lower, perhaps only nine among bodies known so far. The International Astronomical Union (IAU) defines dwarf planets as...

until its adoption by the IAU in 1986. The discovery was made by carefully examining an enlargement of a photographic plate of Pluto and noticing it had...

Mars, Jupiter, Saturn, Uranus, Neptune, Pluto) obsolete (per the IAU definition of planet): Most Vegetables Eat More Juice So Usually Never Pee My Very Educated...

exotic forms of life. Although there are many icy objects in the Solar System, none of them qualify as planets under the IAU definition of planet. However...

time. Under the IAU definition approved on August 24, 2006, Eris, Pluto and Ceres are "dwarf planets", reducing the number of known planets in the Solar...

written before the 2006 IAU definition, but not in a graph of planets, dwarf planets and moons from 2016, where only the eight IAU planets are identified by...

metals. Within the Solar System, the terrestrial planets accepted by the IAU are the inner planets closest to the Sun: Mercury, Venus, Earth and Mars...

about how exactly to define a planet. In 2006, the International Astronomical Union (IAU) adopted a definition of a planet in the Solar System, placing...

to exoplanets. The IAU Working Group on Extrasolar Planets issued a position statement containing a working definition of "planet" in 2001 and which was...

furthered theories of a ninth planet within the Solar System. He founded the Lowell Observatory in Flagstaff, Arizona, and formed the beginning of the effort...

either a white dwarf, neutron star, or black hole. The IAU definitions of planet and dwarf planet require that a Sun-orbiting astronomical body has undergone...

and classical planets. The term planemo ("planetary-mass object") covers all three populations. Stern's and the IAU's definition of 'planet' depends on...

Observatory was named one of "The World's 100 Most Important Places" by Time Magazine. It was at the Lowell Observatory that the dwarf planet Pluto was discovered...

current definition was included in the 2006 IAU resolution that defined the term planet, demoting the status of Pluto to that of dwarf planet. In the...

eight planets according to the IAU definition. For a list of objects in the Solar System once but no longer generally considered planets, see: List of former...

1995). "Destination: Pluto: With a daring, high-speed mission to the icy planet, NASA sets its sights on the solar system's final frontier". Popular Mechanics...

number of the larger members of this group were initially described as planets, in 2006 the International Astronomical Union (IAU) reclassified Pluto and its...

Wright Mons was approved as the official name of the feature by the International Astronomical Union (IAU). Wright Mons is located in Pluto's southern...

Jupiter masses, making them brown dwarfs according to the IAU working definitions. Rogue planets in stellar clusters have similar velocities to the stars...

and large planets also difficult. A definition for the term "sub-brown dwarf" was put forward by the IAU Working Group on Extra-Solar Planets (WGESP),...

Atlas of Mercury. NASA Scientific and Technical Information Office. "USGS Astrogeology: Rotation and pole position for the Sun and planets (IAU WGCCRE)"...