By Michael Anderson
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Extra resources for The Nature of Planets, Dwarf Planets, and Space Objects (Solar System)
Sample text
The redder areas have been chemically altered by small impacts and exposure to the solar wind.
5 times for Pluto. Scientists calculate that 55 The Nature of Planets, Dwarf Planets, and Space Objects it takes Eris some 560 Earth years to complete just one revolution around the Sun. Its orbit is highly eccentric, or elongated, and extremely tilted. Its orbit is so tilted that some scientists call it a member of the Kuiper belt’s scattered disk rather than of the Kuiper belt itself. The surface of Eris may be covered with white methane ice. Eris has one known moon, Dysnomia. The moon is about an eighth as big as Eris and takes about two weeks to circle the dwarf planet.
54 Dwarf Planets The dwarf planet Eris is the largest-known object in the Kuiper belt. Its one known moon is named Dysnomia. NASA, ESA, and M. Brown (California Institute of Technology) Basic Astronomical Data Eris’s diameter of roughly 1,550 miles (2,500 kilometers) makes it slightly larger than Pluto. 5 times for Pluto. Scientists calculate that 55 The Nature of Planets, Dwarf Planets, and Space Objects it takes Eris some 560 Earth years to complete just one revolution around the Sun. Its orbit is highly eccentric, or elongated, and extremely tilted.
