![]() Often such objects continued to be used in literature long after the hypotheses upon which they were based had been abandoned. Some of these objects were, at one time, seriously considered as hypothetical planets which were either thought to have been observed, or were hypothesized in order to explain certain celestial phenomena. The fictional portrayal of our Solar System has often included planets, moons, and other celestial objects which do not actually exist in reality. Unsourced material may be challenged and removed. ![]() This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources.
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