Eris is a dwarf planet that exists beyond Pluto
for two reasons:Pluto is not a planet. It is a dwarf planet.There are 3 more dwarf planets that orbit the Sun beyond Pluto.
Planets that used to be planets but aren't any more. Example: Pluto
Not any more.
Eris is larger than Pluto. Pluto's moon Charon could be considered a dwarf planet. Other objects beyond Pluto are Varuna, Quaoar, Chaos, Sedna, Makemake, Orcus, Haumea, and others. Here is a table comparing sizes: http://en.wikipedia.org/wiki/20000_Varuna
Pluto is the nineth planet from the sun, it is the farthest of the known planets. now it is proven that there are 3 more planets who knows it might be true!!! but Pluto is the ninth planet from the sun!!!!!!
Some astronomers believe in the existence of another planet beyond Pluto, often referred to as Planet Nine, because of the unusual patterns observed in the orbits of distant objects in the Kuiper Belt. These patterns suggest that the gravitational influence of a massive, undiscovered planet could be at play. Further observations and simulations are ongoing to search for evidence of this hypothetical planet.
all planets are gaseous(made out of gas)EXCEPT Pluto because it does not exist any more
When a few dwarf planets had been discovered, it was found they have orbits which are significantly more elliptical and/or more highly inclined to the ecliptic than the eight main planets. Pluto had more in common with the new discoveries so a new class of dwarf planets was started, and Pluto was put into it.
There are no newly discovered planets. Pluto used to be considered a planet, but is no longer. Sedna, Quoar, Eris, and Varuna are just a few of the newly discovered trans neptunian objects (bodies beyond Neptune). Eris is larger than Pluto. Far, far beyond our solar system more than 335 exoplanets (planets orbiting other stars) have been discovered. These are not at all particularly close to our solar system.
They have sent a prob thingie to take pics about pluto. They do that to a lot of planets.
The development of the telescope in the 17th century allowed astronomers to observe planets beyond those visible to the naked eye. This led to the discovery of Uranus in 1781, Neptune in 1846, and Pluto in 1930, expanding the known planets beyond the original five visible to ancient civilizations.
Because for years it was thought that there were 9 planets, which included Pluto. But, in recent years it has been discovered that there are other, smaller, dwalf or minor planets which lay beyond the orbit of Pluto. Some of these dwalf planets are as big or even possibly bigger than Pluto. So, a decision had to be reached to either downgrade Pluto to the status of a dwalf or minor planet or include all of these other objects (and nobody knows precisely how many there are) into the main system of planets. If they were all included allthe minor planets into the major system of planets they would all need to be named, so the decision was taken to downgrade Pluto to simplify matters. So now there are only 8 major planets and many more, mostly un-named and undiscovered minor or dwalf planets.