The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

A planetary system anchored by a dead white dwarf star ... times that of Jupiter, the solar system's most massive planet. This object is likely to be a "brown dwarf," a body often referred ...

But the question remains as to whether a planet could retain a water-rich environment through the red giant stage of a star before it becomes a white dwarf ... Our own solar system, for example ...

NASA artist’s conception of a brown dwarf (main) and stock image of the planets in the solar system (inset). An object between 2 and 50 times the mass of Jupiter may have flown through our ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...