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New dwarf planet spotted at the edge of the solar system
(www.newscientist.com)
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This dwarf planet is 90 AU from US not from the sun. They just said that the dwarf planet is 90 AU away from us and that 1 AU is equal to the distance between the sun and the earth.
But since the dwarf planets orbit is extremely eccentric that varies heavily.
You are right. I stand corrected.