Found: A planet with no star, free-floating in space

• Floating planet PSO J318.5-22found by Hawaii’s Institute of Astronomy
• The planet is 80 lightyears from Earth and formed 12 million years ago
• It is similar to other gas-giant planets found orbiting young stars
• Yet, PSO J815.5-22 does not have a host star and is ‘drifting on its own’

http://www.dailymail.co.uk/sciencetech/article-2452217/A-lonely-planet-Giant-gas-world-sun-orbit-floating-space.html

From Wikipedia- Definition of Planet

A planet (from Ancient Greek ἀστὴρ πλανήτης (astēr planētēs), meaning “wandering star”) is an astronomical object orbiting a star orstellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and hascleared its neighbouring region of planetesimals.^[a][1][2] The term planet is ancient, with ties to history, science, mythology, and religion. The planets were originally seen by many early cultures as divine, or as emissaries of deities. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. In 2006, the International Astronomical Union (IAU) officially adopted a resolution defining planets within the Solar System. This definition has been both praised and criticized and remains disputed by some scientists because it excludes many objects of planetary mass based on where or what they orbit. While eight of the planetary bodies discovered before 1950 remain “planets” under the modern definition, some celestial bodies, such as Ceres, Pallas,Juno, Vesta (each an object in the Solar asteroid belt), and Pluto (the first-discovered trans-Neptunian object), that were once considered planets by the scientific community are no longer viewed as such.