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Is Dwarf Planet ERIS larger than Pluto???

Eris larger than pluto

The detection of ERIS provoked debate about Pluto’s classification as a planet. Eris is slightly larger than Pluto.

So if Pluto qualified as a full-fledged planet, then Eris certainly should too. Astronomers attending the International Astronomical Union meeting in 2006 worked to settle this dilemma. In the end, we lost a planet rather than gaining one. Pluto was demoted and reclassified as a dwarf planet along with Eris and the asteroid Ceres, the most massive member of the asteroid belt.

Adding insult to injury for the former ninth planet, Brown has now determined that Eris is also more massive than Pluto. This new detail was determined by observations of Eris’ tiny moon Dysnomia. The Hubble Space Telescope and Keck Observatory took images of the moon’s movement, from which Brown precisely calculated Eris to be 27 percent more massive than Pluto. In fact, if you scooped up all the asteroids in the asteroid belt they would fit inside Eris, with a lot of room to spare.

Currently, Eris is more than three times farther from the Sun than Pluto. It is so cold out there that the dwarf planet’s atmosphere has frozen onto the surface as a frosty glaze. The coating gleams brightly, reflecting as much sunlight as fresh fallen snow. The path Eris takes around the Sun is shaped like an oval rather than a circle. In about 290 years, Eris will move close enough to the Sun to partially thaw. Its icy veneer will melt away revealing a rocky, speckled landscape similar to Pluto’s.

January 25, 2009 - Posted by | Fact, Personal | , ,


  1. This is very interesting. Heard of Planet x?

    Comment by Byron | January 25, 2009 | Reply

  2. Hi! Nice entries. XD

    Comment by Raymond | January 25, 2009 | Reply

  3. this is a very information entry. thanks for sharing

    Comment by -dylan- | January 25, 2009 | Reply

  4. It’s useful information to share

    Comment by Humorbendol | January 25, 2009 | Reply

  5. Both Eris and Pluto are planets because because unlike most objects in the Kuiper Belt, they have attained hydrostatic equilibrium, meaning they have enough self-gravity to have pulled themselves into a round shape. When an object is large enough for this to happen, it becomes differentiated with core, mantle, and crust, just like Earth and the larger planets, and develops the same geological processes as the larger planets, processes that inert asteroids and most KBOs do not have.

    Not distinguishing between shapeless asteroids and objects whose composition clearly makes them planets is a disservice and is sloppy science.

    The International Astronomical Union did not settle this dilemma–they only confused it further. Their definition makes no lingusitc sense because it says dwarf planets are not planets at all. That’s like saying a grizzly bear is not a bear. Second, it defines objects solely by where they are while ignoring what they are. If Earth were placed in Pluto’s orbit, by the IAU definition, it would not be a planet. That is because the further away an object is from its parent star, the more difficulty it will have in clearing its orbit.

    Significantly, this definition was adopted by only four percent of the IAU, most of whom are not planetary scientists. No absentee voting was allowed. It was done so in a highly controversial process that violated the IAU’s own bylaws, and it was immediately opposed by a petition of 300 professional astronomers saying they will not use the new definition, which they described accurately as “sloppy.” That petition can be found at

    Also significant is the fact that many planetary scientists are not IAU members and therefore had no say in this matter at all.

    Many believe we should keep the term planet broad to encompass any non-self-luminous spheroidal object orbiting a star.
    We can distinguish different types of planets with subcategories such as terrestrial planets, gas giants, ice giants, dwarf planets, super Earths, hot Jupiters, etc.

    We should be broadening, not narrowing our concept of planet as more objects are being discovered in this and other solar systems.

    Using this broader definition, not only do we not lose a planet; we actually gain several. The planets of our solar system, under this far superior definition, are: Mercury, Venus, Earth, Mars, Ceres, Jupiter, Saturn, Uranus, Neptune, Pluto, Haumea, Makemake, and Eris.

    Comment by Laurel Kornfeld | January 25, 2009 | Reply

  6. @ laurel

    thanx mate for your useful info. Do keep in touch..

    Comment by starbozz | January 26, 2009 | Reply

  7. Nice research and information.
    And if possible try xploring my page at

    Comment by anush | January 26, 2009 | Reply

  8. first comment here 🙂

    Comment by Tony | January 26, 2009 | Reply

  9. Wouwww…where is the position of Eris?
    It’s first time I heard about that…
    Nice post….keep writing good thing

    Comment by isfiya | January 27, 2009 | Reply

  10. wah in english — lha i’m not understand :mrgreen:

    Comment by hmc | January 27, 2009 | Reply

  11. I did’t know the latest information about this. That I heard Pluto is not planet. I heard there are 15 palnet found out in the world..but It’s true or not I don’t know.. 🙂

    Comment by cahayadihati | January 27, 2009 | Reply

  12. Hi…I’m rhe…visit to my blog at Sorry my English not good.Thanks….

    Comment by rheifania | January 28, 2009 | Reply

  13. wah in english — lha i’m not understand too…

    Comment by isdiyanto | January 28, 2009 | Reply

  14. just litle-litle understand.. he..he..

    Comment by isdiyanto | January 28, 2009 | Reply

  15. nice post! very informative… thank u for sharing 🙂 keep it up!~

    Comment by JeanGrey | February 1, 2009 | Reply

  16. nice post and nice picture

    Comment by Rian | December 2, 2009 | Reply

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