Planet X: The new planet in our solar system?
发布时间 2016-01-22 15:16:50 来源
摘要
Two scientists claim they have the best evidence yet showing there’s a ninth planet at the outer edge of our Solar System. Called Planet X, it would be about 10 times the mass of Earth and orbit around the Sun once every 10,000 to 20,000 years. The only problem with the theory? We haven’t actually seen this planet yet.
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