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Cinnamon

Theoretical "Planet 9" May Have Been Captured from Another Star

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A new study from astronomers at Lund University in Sweden suggests that Planet 9—a theoretical planet orbiting in the outer reaches of our solar system—may not have formed around our sun. Instead, their model suggests that the planet, if it exists, was probably captured from another star when the sun had just begun its life 4.5 billion years ago. 

There is strong evidence to suggest that something about 10 times the mass of Earth is orbiting the sun at an incredible distance. Astronomers can measure this object's gravitational influence on the orbits of the outer planets such as Uranus and Neptune, though we have not actually seen Planet 9. 

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http://www.popularmechanics.com/space/deep-space/a21092/planet-9-captured-from-another-star/

I don't like Popular Mechanics, but here they are acknowledging that another planet is likely out there. 

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http://www.upi.com/Science_News/2016/05/31/Study-suggests-Planet-9-is-stolen-exoplanet/4901464705120/

LUND, Sweden, May 31 (UPI) -- New research suggests the mysterious and controversial "Planet 9" isn't an original member of our solar system. According to a new computer simulation developed by astronomers at Lund University in Sweden, the ninth planet is an exoplanet -- stolen by the sun from its original host star.

"It is almost ironic that while astronomers often find exoplanets hundreds of light years away in other solar systems, there's probably one hiding in our own backyard," researcher Alexander Mustill said in a news release.

Most stars are born in clusters. The orbits of newborn stars often put them in relatively close proximity. The new simulation suggests that as our sun and another star passed by each other, the gravitational pull of our sun pulled in an exoplanet -- a theft that's gone unnoticed until recently.

It's likely that prior to its kidnapping, Planet 9 -- also known as Planet X -- was bullied to the outer edges its original star system by other planets.

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