Hypothetical planets

hypothetical large planet in the far outer Solar System

planet that is hypothesized to have impacted Earth and created the Moon

hypothetical planet between the Sun and Mercury

Öpik–Oort Comet Cloud hypothetical planet

any Solar System planet that might orbit the Sun beyond Neptune

hypothetical former Solar System planet

Wikimedia list article

scientific proposal in 2002 for a destroyed fifth planet

thought experiment by philosopher Hilary Putnam

any of various hypothetical planets thought to have existed

variable star in the constellation Chamaeleon