1. Planets beyond NeptuneFollowing the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell's quest for Planet X.
Read “Planets beyond Neptune” on English Wikipedia
Read “惑星X” on Japanese Wikipedia
Read “Planets beyond Neptune” on DBpedia
Read “Planets beyond Neptune” on English Wikipedia
Read “惑星X” on Japanese Wikipedia
Read “Planets beyond Neptune” on DBpedia
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