Every planet must orbit around a star

In recent times the wandering planets, which is the name often these unique worlds without star have gone from a rarity bordering on the impossible to be an unexpectedly abundant class of planets.

 Fresh investigate now provide an new revelation: Not only are there no star planets, bound only to its galaxy, but even without galaxy may have planets. These amazing worlds, formed within a galaxy may leave due to move at a colossal speed, and could make the trip alone or with their star.

 It was already known of intergalactic stars, ejected from its galaxy as a result of strong orbital perturbations, often in the context of violent astrophysical phenomena. But it was unclear who might have planets capable of following in his cosmic journey, and seemed virtually impossible that any planets without a star or galaxy.

The results of the new study, conducted by the team astrophysicist Avid Loeb, Center for Astrophysics (CfA) in America, jointly run by Harvard University and the Smithsonian Institution, indicate not only that there are planets that have escaped from galaxies, but also some of them may be traveling at very high, up to more than 4 percent of the speed of light. These planets would take only half a minute to travel the distance separating the Earth from the Moon.

Hypervelocity planets, as they began to call, would be among the fastest stars in the universe. "Apart from subatomic particles, I know of no object that is moving away from our galaxy as fast as these planets escaped," says Ivan Ginsburg with feeling of Dartmouth College in Hanover, New Hampshire, USA, member of research team.

The planets hypervelocity gain speed and begin their amazing journey through mechanisms similar to those that accelerate the wandering stars. The typical case begins with a pair of stars that are too close to the supermassive black hole stays in the center of the galaxy. The powerful black hole's gravitational field breaks the bond orbital that kept both suns circling each other, creating a sudden imbalance. As a result, a star goes into orbit the black hole, while the other is thrown away on a fast path which can lead to escape the galaxy.

The authors of the new digital study models implemented in a number of sophisticated simulations of what would happen if each of these two stars have typical case revolving around one or two planets in orbits close to her. Simulations indicate that the star could drag it catapulted their planets during the cosmic journey. The gravitational capture of another star by the black hole could liberate the planets from their bondage with her, and the result would be that these planets would go away at great speed, a trip potentially capable of bringing them out of the galaxy.

A typical hyper planet would begin his career being accelerated to a speed of between 11 and 16 million kilometers per hour (between 7 and 10 million miles per hour). However, few of them could reach much higher speeds if conditions were right, can reach no less than 48 million kilometers per hour (30 million miles per hour). At this tremendous speed it takes about 5 hours to cover the distance from the Sun to Mars, about 16 hours to cover between it and Jupiter, and about 4 days to cover the distance between the Sun and the distant planet our solar system.

Observing systems currently available cannot detect a planet hyper alone, due to the minimal light that is expected to issue such a star, and also by the great distance that will surely separate from the Earth. However, other astronomers could detect a planet companion of a hypervelocity star in the neighborhood of our galaxy, using the strategy to monitor the brightness of the star dims to check periodically in a way that betrays the presence of a planet revolves around the star and its brightness a little dark star passing directly between it and the Earth and some that cover our starlight. Moreover, the planets traveling with their hypervelocity star must be far more abundant than traveling alone.

Thanks to its high speed, hyper-like planets may be able to overcome the galactic gravitational field and escape the Milky Way or galaxy where they formed, eventually becoming empty intergalactic travelers.