posted September 10, 2009 03:18 PM
Eris not an asteroid,and it's classed as a dwarf planet.
it's a transneptunian object
if Eris an asteroid, then Pluto is one too.
After all Eris larger than Pluto.
transneptunians are minor planets in the outer regions of the solar system. Pluto is actually a member of the kuiper belt object.
The discovery of the kuiper belt was discovered when 1992 QB1 was found, and that proved that Pluto wasn't alone in the outer regions of the solar system. Now it turns out that it has thousands of neighbors. His mass,size doesn't even come close to clearing out the orbit of the kuiper belt region. That's why it was stripped of its planethood.
Ceres is an asteroid, but is also classed as a dwarf planet. It's the only asteroid that is classed as a dwarf planet. It's an atypical asteroid for that matter with its roundness,size,and its significant amounts of water ice. There is some suspicion that it has connections to the Kuiper Belt which is the transneptunian minor planet belt that Pluto belongs to.
asteroids are minor planets in the inner regions of the solar system. most of them orbit between Mars and Jupiter. Ceres orbits between Mars and Jupiter.
like Pluto, Ceres was also classed as a planet in the 1800's and then it was stripped of its planetary status when it was found to be a new class of objects.
so it could be argued if Pluto is a planet, then so is Ceres.
btw Pluto's actual size wasn't determined until the discovery of its moon,Charon in 1978. Before that, Pluto was thought to be as big as our Earth. That's one of the reasons why Pluto was thought to be a planet. It was also found when it was on the ecliptic too. Pluto tends to travel far off the ecliptic like no planet has ever done. It can go off the ecliptic by 17 degrees and enter other constellations that are not on the ecliptic.
Ceres was also thought to be much larger when it was classed as a planet.
The only reason Pluto is so recognized as a planet is because it was discovered between the early and mid 1900's and was classed as a planet for 70 years. Ceres was discovered before Neptune was discovered too. It was classed as a planet for 50 years.
Raymond
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"Nothing matters absolutely;
the truth is it only matters relatively"
- Eckhart Tolle