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Answered 2011-09-06 00:29:00

As Pluto, a dwarf planet, is no longer counted as a planet, there are now only 8 known planets in our solar system.

It remains to be seen if the discovery of extra-solar planets affects how we classify objects within our solar system. Several hundred likely planets have been detected orbiting other stars, with the possibility that there are other solar systems like our own. By late 2011, a total of 599 exoplanets had been identified and another 1235 were pending corroboration.

Status of Pluto

Pluto is a dwarf planet in the solar system and the prototype of a yet-to-be-named family of Trans-Neptunian objects. From its discovery in 1930 until 2006, it was considered the ninth and smallest of the planets of the Solar System, both by the International Astronomical Union (IAU) and the general public. After much debate, the IAU decided on August 24, 2006 to reclassify Pluto as a dwarf planet, requiring that a planet must "clear the neighborhood around its orbit." Further observations may also affect the definition of Charon as a moon of Pluto, possibly the classification of the two as a binary planet.


Related Questions

There are eight planets in the solar system. For a brief period, the newly-discovered object, Eris was considered for planetary status, but the discovery led to a debate that ended with Pluto losing its status as a planet.

Pluto is the second most massive dwarf planet. Initially it was considered 9th planet of our solar system but a debate raged for 75 years over its legitimacy as a planet. Discovery of Eris a much bigger body urged International Astronomical Union to describe in 2006 what a planet is. According to the definition Pluto was stripped of its planetary status.

-- a cat has 9 lives -- "a stitch in time saves 9" -- 9 planets in our solar system (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto) except that poor Pluto has now been stripped off its planetary status! ALSO: "Eight tiny reindeer & Rudolph" = 9 reindeer for Santa's Sleigh!

Mercury has a diameter of 4,879km and a mass of 0.330x1024kg. This is 1/18 the mass and 1/3 the diameter of Earth. Compared to other planets in our solar system, Mercury is the smallest - at least now that Pluto has been demoted from planetary status.

Technically, the planetary status of pluto is no longer a planet, but the term "planet" is simply a name. Scientists have decided that Pluto is no longer a planet mainly because it is just too small. Larger planetary objects have been discovered, and those are not considered planets, so just to keep things simple, Pluto is not considered a planet but as a large planetary object.

It was not "found out" but a decision that was made by a panel of planetary experts to define what is a planet and what is not which "degraded" Pluto from planet status of "dwarf planet" on August 24, 2006.There are at least 44 dwarf planets known.

Venus is one of the "Inner" planets, along with Mercury, Earth and Mars. The "Outer" planets are Jupiter, Saturn, Uranus, Neptune and Pluto (which has recently been stripped of it's true "planet" status!) Inner planets are also known as "Terrestrial Planets" because they have a rocky surface. The difference between inner and outer planets is there location within or beyond the asteroid belt. Of course, inner planets are within the belt, while the outer ones are beyond the belt.

In 2006 the international astronomical union changed the definition of what a planet was. This meant that Pluto no longer met the definition of what a classic planet was and it was demoted to a dwarf planet status instead.

No. Officially there are eight planets in the solar system. In 2006 the International Astronomical Union convened do come up with a definition of a planet. The first definition they developed would have brought the total number of planets to 11; Pluto would remain a planet and Ceres and Eris would receive planetary status. This definition was discarded in favor of a stricter one which demoted Pluto from planet to dwarf planet.

Moon is not a planet - It is a satellite. Several planets in our solar system have moons (one or more) that happen to have names. Our moon doesn't have one. The coldest planet in our solar system used to be Pluto until it was demoted from the planetary status. Now it is Uranus.

P. G. Steffes has written: 'Laboratory measurements of microwave and millimeter-wave properties of planetary atmospheric conditions' -- subject(s): Refractivity, Atmospheric composition, Planetary atmospheres, Spectroscopic analysis, Millimeter waves, Absorptivity, Microwaves 'Pioneer-Venus radio occultation (ORO) data reduction' -- subject(s): Absorptivity, Pioneer Venus spacecraft, Radio occultation, Error analysis, Sulfuric acid 'Report to the National Aeronautics and Space Administration, semiannual status report #17 for grant NAGW-53' -- subject(s): Atmospheres, Microwaves, Planets 'Report to the National Aeronautics and Space Administration, semiannual status report #3 for grant NAGW-533' -- subject(s): Atmospheres, Microwaves, Planets 'Laboratory evaluation and application of microwave absorption properties under simulated conditions for planetary atmospheres' -- subject(s): Atmospheres, Microwaves, Planets

The planets with multiple moons are Mars (2), Jupiter (67), Saturn (62), Uranus (27), and Neptune (14). Worth mentioning is Pluto, which is no longer a planet, with five moons. Three of those moons were discovered before it lost planetary status.Mars (2), Jupiter (67), Saturn (62), Uranus (27), Neptune (14).

Jupiter's planetary status has never and most likely never will be questioned. As of the this answering, Jupiter is a planet.

Makes me want to go there one day in the uture like 2025. it make me want to hurt whoever demoted Pluto from planetary status >:(

Pluto is not "gone", but its planetary status is. its orbital path is not circular enough and by saying that, it does cross neptunes orbital path. that breaks the definition of a planet.

There are only 2, now that Pluto has lost its status as a planet. They are Uranus and Neptune.

Gravity and inertia. The Sun's gravity holds all the planets in orbit with its immense gravity, and the planets have no tendency to change their orbits due to the law of inertia which implies that the planets will stay in their elliptical patterns until a force acts on them to change that status.

Only two planets have ever "lost" their status as a major planet:Ceres (downgraded in the 1860s)Pluto (downgraded in 2006)

mercury is the smallest planet now because Pluto's status was changed from planet to dwarf planet, making mercury the smallest planet.

nope, NASA has them all mapped out, Pluto lost planet status. Edit : We probably know all the planets in the Solar System, but N0T in the whole Universe.

This is called a binary planet. They are ususally very close together and share a gravitaional pull. A good example of a binary planet planet is the ex-planet Pluto, which rotates with it's satellite Charon. Charon was believed to have been the "moon" belonging to Pluto, but recently scientists decided to strip Pluto of it's "planetary" status, and have also stripped Charon of it's "moon" status. They have now been renamed and are considered to be BINARY stars. Pluto is considered to be a "minor" planet now because of this.

The International Astronomical Union introduced a new term in 2006 that is frequently used now - dwarf planet. Pluto was demoted from planetary status to dwarf planet, and several others have been found, all beyond the orbit of Neptune, and they are thus called "trans-Neptunium objects". Almost certainly, more will be discovered as time goes on.

There are three forms of planets within our own solar system. There are the 'rocky' planets, such as Mercury, Venus, Earth, and Mars, the 'gas' planets such as Jupiter and Saturn (freely interchangeable with 'Gas Giants') and the 'ice' planets that are Uranus and Neptune. Pluto, as you likely know, is no longer considered a planet but is now rather categorized as a 'dwarf' planet, of which there are now 40 known (and still growing) such objects that orbit our sun in the Kuiper belt. Bonus: initially billed as our '10th' planet when it was discovered in January 5, 2005 from images that were taken on October 21, 2003 (and actually found to be larger than Pluto) 'Eris' was also 'demoted' to being just a 'dwarf' planet. Both Pluto and Eris, had they retained their planetary status, would both be considered 'Icy' planets.

This is a fine wine from Tuscany that does not conform to the traditional rules and therefore cannot achieve DOC or DOCG status but instead is given IGT status.

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