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Hypothetical planet

Hypothetical planets are planets and other heavenly bodies that have been suggested as possibly existing (or have been believed to exist), but have never been proven to actually exist. This includes bodies that have later been proven not to exist.

Examples of such hypothetical planets in astronomy or in ancient mythologies include:

Planets which would have a direct influence on Earth:

Planets with independent influence: Other heavenly bodies:

See also: Giant impact theory, Tom Van Flandern

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