An Etymological Dictionary of Astronomy and Astrophysics

A hypothetical → planet which once was postulated to have existed between the orbits of → Mars and → Jupiter and its destruction supposedly led to the formation of the → asteroid belt. The idea of such a hypothetical planet was first put forward by the German astronomer Heinrich Wilhelm Olbers (1758-1840).

See also: In Greek mythology Phaeton was the sun god Helios. Phaeton tried to drive his father’s solar chariot but crashed after almost setting fire to the whole earth.