Ex-planets?
That there should large number of planets sized bodies that orbits the milky way without any close association with any particular star is expected and should come as no surprise. We've discovered many planetary systems in which a large jupiter like planet orbits very close to the star, much closer then mercury is to our sun. The planets could not have formed at this distance from its sun, and must have migrated a great ways inward from where they were formed further out. The conservation of energy dictates such planets must have transfered a great deal of its orginal orbital energy to something else to accompolish the transfer inward. One very likely candiate is another planet. As one planet transfers its orbital energy to another, the planet lossing its energy migrate inwards, the planet gaining the energy escapes the solar system all together.
That there should large number of planets sized bodies that orbits the milky way without any close association with any particular star is expected and should come as no surprise. We've discovered many planetary systems in which a large jupiter like planet orbits very close to the star, much closer then mercury is to our sun. The planets could not have formed at this distance from its sun, and must have migrated a great ways inward from where they were formed further out. The conservation of energy dictates such planets must have transfered a great deal of its orginal orbital energy to something else to accompolish the transfer inward. One very likely candiate is another planet. As one planet transfers its orbital energy to another, the planet lossing its energy migrate inwards, the planet gaining the energy escapes the solar system all together.
