EPISODE · Nov 15, 2019 · 3 MIN
“X行星”是真实存在的吗？它才是太阳系真正的第九大行星
from 天文随心听｜讲述宇宙与人的故事
太阳系有八大行星，人类赖以生存的地球就是其中之一，上个世纪三十年代，冥王星被确立为太阳系第九大行星，相关概念也得到了人们的认可。然而随着研究的不断深入，人们渐渐认识到其他行星与冥王星存在一定的差异，由此推出行星的划分标准，于是冥王星被归为矮行星。
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“X行星”是真实存在的吗？它才是太阳系真正的第九大行星
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