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Originally Posted by resenmut
Trujillo has begun to examine the object's surface with one of the world's largest optical/infrared telescopes, the 8-meter (26-foot) Frederick C. Gillett Gemini Telescope on Mauna Kea, Hawaii. He said, "We still don't understand what is on the surface of this body. It is nothing like what we would have predicted or what we can currently explain.
What for so unusual surface is it??!!
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We don't know yet. That's the point. It could be rock, it could be some kind of ice, it could be some optical effect in the telescope (have they taken a spectrum of this thing yet?). It will be some time before we figure that out.
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Originally Posted by resenmut
Is not it dark matter??!!
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Not a chance. Sedna is way too small to account for dark matter without there being hundreds of trillions of them. Moreover, most of them would have to be in the Milky Way's arms and almost none in the nucleus for it to be dark matter. Where planetoid formation is a commom after-effect of star formation, it seems highly unlikely that the galaxy would have that kind of distribution of Sedna-like objects.