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  3. Scientists said they have found evidence of a giant planet far out in our solar system. In a statement, the California Institute

Scientists said they have found evidence of a giant planet far out in our solar system. In a statement, the California Institute

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问题    Scientists said they have found evidence of a giant planet far out in our solar system. In a statement, the California Institute of Technology—Caltech—said this planet travels a very strange "long and thin orbit in the distant solar system. " The discovery was made by two researchers at Caltech: Konstantin Batygin and Mike Brown. They used mathematical modeling and computer simulations(模拟) to find the planet. So far, there have not been any direct observations of the planet.
   "My jaw hit the floor," said astronorner(天文学家) Mike Brown, the moment he realized there might be a ninth planet.
   The scientists said it would take this planet 10,000 to 20,000 years just to make one full orbit around the sun. The new planet, called "Planet Nine", has a mass about 10 times the size of the earth. If they are right, the newly found planet would be the ninth planet in our solar system. Pluto (冥王星) had been called the ninth planet until 2006, when it was renamed a "dwarf planet".
   Actual confirmation of a ninth planet would be very big news. "This would be a real ninth planet," Brown said in the statement. " There have only been two true planets discovered since ancient times, and this would be a third. It’ s a pretty substantial part of our solar system that’ s still out there to be found, which is pretty exciting. "
   While they did not get a picture of " Planet Nine" yet, the scientists say they are using the biggest and best telescopes on the earth to try to find " Planet Nine". They are also working on improving their computer simulations. They want to find out more about "Planet Nine’ s orbit" , and its impact on the outer part of our solar system.
According to the scientists, ______.
选项 A、the planet is eight times larger than the earth
B、it takes the planet less than 10,000 years to make a full orbit
C、Pluto was once thought to be the ninth planet in the solar system
D、Pluto was given a new name after it was discovered in 2006
答案C
解析 根据第三段最后一句“Pluto had been called the ninth planet…”可知，冥王星曾经被认为是太阳系的第九颗行星，因此选项C正确。选项A表达有误，应为“是十倍”而非“是八倍”；根据第三段第一句可知，选项B错误；选项D应是冥王星在2006年被重新命名而非被发现。故选C。
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