Planetary objects proposed in religion, astrology, ufology and pseudoscience

There are a number of planets or moons whose existence is not supported by scientific evidence, but are proposed by various astrologers, pseudoscientists, conspiracy theorists, or certain religious groups.

Lilith

Lilith is the name given to a hypothetical second moon of Earth, supposedly about the same mass as the Earth's Moon, proposed in 1918 by astrologer Walter Gorn Old, who called himself Sepharial. Sepharial applied the name Lilith from medieval Jewish legend, where she is described as the first wife of Adam. Sepharial claimed that Lilith was the same second moon that scientist Georg Waltemath claimed to have discovered twenty years earlier. Sepharial also claimed to be the first person in history to observe Waltemath's moon as it crossed the sun, and rationalized that it was too dark to be otherwise visually detected.

Sepharial's comments ignored the fact that Waltemath's proposed moon had already been discredited by the scientific community at the turn of the century. There are many readily apparent holes in the arguments supporting Lilith's existence, and the existence of this astronomical object is believed only by fringe groups.