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Sun hypothesis theft 9th planet from another star

Updated on April 7, 2016

In January 2016, the two researchers Batygin, Konstantin and Michael Brown published evidence indicates a planet not yet observe great 10 times the Earth is nestled at the edge of the outer solar system. Other astronomers immediately put out many theories on how the ninth planet or Planet X migrated from the rim in addition to ring out of the system, according to New Scientist.

However, a different research group proposed the planet X hypothesis were kept back from the neighbor star. This hypothesis is likely to occur. The Sun is born in a large cluster with about 1,000-10,000 stars, according to Alexander Mustill in Lund Observatory, Sweden. In the cluster with the density, so the Sun can undergo several times closer to the star and swap the planet with them.

"The theory that the Sun captured the planet in another star system and bring it under throughout the route result is incredible", Greg Laughlin at the Lick Observatory, California, United States of America, commented.

To test the hypothesis, Mustill and colleagues simulated the encounter between the solar system with planets passing. They discovered that if one has the planets orbits broad, likely it gets the Sun retained is 50%.

But the rate on quite high, the hypothesis becomes less sure when considering whether a passing star has planets orbits not wide. The simulation also only true when planets hold identical to planet x. Mustill and colleagues argue that the probability of Planet X has originated outside the solar system lie in the range 0.1-2%.

"Although the number seems low, you need to compare the ability of each other. Because after all, every particular case are not sure ", Mustill said.

Planet X opportunities really exist just 0.007% at the present time, so likely it is planets beyond the solar system also is higher than 15-300 times.

At first, Batygin and Brown that planet X more likely to be the core of a gas giant planet shot out from the rim of the solar system while the system is forming in the beginning. "My hypothesis is that events happen very soon and have a lot of gas around the Nebula, causing the core moving slow and not completely knocked out of the solar system," Brown said.

The last hypothesis is the planet X in its present location. Although some researchers speculate there is not enough material in the main planetary formation outside the solar system, Scott Kenyon in the center of the Harvard-Smithsonian Astrophysics in Massachusetts, us, discovered the amount of gravel 200 million years ago the ice enough to form a small planet as the planet X. "I think it's too early to conclude any hypothesis is most certainly" , Kenyon said.

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