which is the farthest planet from the sun?

Answer 1

Good answer from Questor but s/he is wrong on one thing. Sedna is not yet recognised as a dwarf planet. It may well become so recognised but it isn't yet.

The planet that is furthest from the Sun is Neptune (discovered 1846)

Perihelion: 29.810 AU
Aphelion: 30.327 AU
Orbital period: 60,223 days (164.88 years)

The dwarf planet that is furthest from the Sun is 136199 Eris (a Scattered Disk Object) (discovered 2003).

Perihelion: 37.77 AU
Aphelion: 97.56 AU
Orbital period: 203,500 days (557 years)

The Trans Neptunian Object that is furthest from the Sun is 90377 Sedna (an Extended Scattered Disk Object that goes out as far as the Oort cloud) (discovered 2003)

Perihelion: 76.156 AU
Aphelion: 975.056 AU
Orbital period: 4,401,380 days (12,050 years)

The exoplanet that is furthest from the Sun is OGLE-2005-BLG-390Lb

Discovered on January 25, 2006, this is the most distant and probably the coldest exoplanet found to date. It is believed that it orbits a red dwarf star around 21,500 light years from Earth, towards the center of the Milky Way galaxy.

It was discovered using gravitational microlensing, and is estimated to have a mass of 5.5 times that of Earth, making it the least massive known exoplanet to orbit an ordinary main-sequence star.

Prior to this discovery, the few known exoplanets with comparably low masses had only been discovered on orbits very close to their parent stars, but this planet is estimated to have a relatively wide separation of 2.6 AU from its parent star (a little less than the distance that Ceres is from the Sun),

Answer 2

Glad to see people are taking interest in their education. The farthest planet at this time would have to be Eris. Pluto is no longer a planet because it got demoted in the 2006 re-definition of a planet. Neptune would not fir because its not the farthest. Eris is the largest dwarf-planet that we know of as of right now. it is an object that resides in the Kuiper Belt, and is bigger than Pluto. Eris got its name from the Greek Goddess. Eris is currently the planet with the most amount of time needing to complete a full orbit which is 556.7 years. The diameter of Eris has been measured to be 2400 km using images from the Hubble Space Telescope. The Hubbe Space Telescope is the bestthing we have that can show the planet but you have to measure just right.

Answer 3

Dear Evermore,
The good scientists of planet Earth have recently decided to be complete idiots and declassified Pluto as a planet.

As for your question, the farthest planet from the sun IN OUR SOLAR SYSTEM is Neptune, but I'm positive that there are many more planets in other solar systems that are farther out.

Answer 4

Since Pluto got demoted August 24,2006 that would make Neptune the farthest planet.

Answer 5

Since 1930, the solar system’s planets were: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. At the 2006 conference of the International Astronomical Union, a draft resolution was put forward for a planetary definition which included Ceres (the largest of the asteroids), Pluto and its largest moon, Charon (because unlike the situation with other moons, Charon orbits a point which is above the surface of Pluto, so they can be considered a double planet), and Xena (a newly discovered object larger than Pluto).
However, this resolution was rejected and a new one submitted, voted on and accepted. As a result of the new resolution, Ceres, Pluto, Xena (now officially named Eris) and Sedna were classified as “Dwarf Planets”. Though to my mind, that still makes them planets, just as a human dwarf is still a human. On that basis, which one is the most distant?
At the time Eris was discovered, it was 97 Astronomical Units (AU) from the Sun; that is 97 times the distance of the Earth to the Sun, which is about 93 million miles. That puts Eris at 9,021 million miles from the Sun. At the time that Sedna was discovered, it was about 90 AU from the Sun, making it considerably closer than Eris, but that was just at the time of discovery. It has been estimated that Sedna’s eccentric orbit brings it to 76 AU of the Sun, and out as far as 975 AU! This certainly puts it considerably further away than Eris, which ranges from 37 to (only) 97 AU.
So, at the moment, Eris is the furthest known dwarf planet from the Sun; Sedna is the dwarf planet with an orbit which will take it further from the Sun than any other known planetary object, and if you discount dwarf planets, the most distant planet is Neptune, at a distance of a mere 30 AU.
For completeness, Pluto orbits at a distance between 29 and 49 AU.
Take your pick :)

Answer 6

I'm going with the answer given by mikeg1992.
I was hoping to find a list of exoplanets with their distance from us, but I have not found such a list yet.
The site below is from the Working Group on Extrasolar Planets (updated August 2006). It gives names of stars so a patient person could look up the distances and find out which is furthest.

In our solar system, Neptune is the furthest, as Pluto has been demoted. Pluto is further out than Neptune and will be so for a few centuries (in 1999, it finished being slightly closer).

Answer 7

Neptune is the farthest one from the sun, that we know of, because Pluto is no longer considered a planet.

Answer 8

For most of the year, Pluto is the farthest from the sun (if you consider it a planet), but every few years, the orbits of Neptune & Pluto pass, and so for a few days of a select year, Neptune is the farthest.

Answer 9

At present pluto is the farthest planet
but some times nepyune is the largest planet

Answer 10

If you are talking about "Planet" then its Neptune. If you include dwarf planets, then its Eris, the newest official addition to the solar system. There are other trans-Neptonian objects, like Pluto and Eris, that are named, but they have not been officially classified yet. I think some of these might be even further than Eris. By the way, Eris used to be nick named Xena.