| 31. | By 1992, astronomers discovered more trans-Neptunian objects _ masses beyond Neptune that orbited the sun.
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| 32. | Under this new definition, Pluto and the other trans-Neptunian objects do not qualify as planets.
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| 33. | The discovery of several other trans-Neptunian objects approaching the size of Pluto, such as Eris.
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| 34. | As Neptune traveled outward, it scattered many trans-Neptunian objects into higher and more eccentric orbits.
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| 35. | Pluto was easiest to find because it has the highest apparent magnitude of all known trans-Neptunian objects.
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| 36. | Many thousands of objects of this size range have yet to be discovered in the Trans-Neptunian region.
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| 37. | Known trans-Neptunian objects are often divided into two subpopulations : the Kuiper belt and the scattered disc.
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| 38. | By 2005, three trans-Neptunian objects comparable in size to Pluto ( Eris ) had been reported.
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| 39. | "" " is a trans-Neptunian object orbiting the Sun in the scattered disc.
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| 40. | In 1900 and 1901, Harvard College Observatory director William Henry Pickering led two searches for trans-Neptunian planets.
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