The biggest solar system ever found

Sarah Fecht reports at Popular Science

Scientists used to suspect a giant planet named "2MASS J2126-8140" was a rogue world, wandering the galaxy without a star to orbit. But it turns out the planet isn't homeless after all: its star is just very, very far away. Like, a trillion kilometers away (or about 621,000,000,000 miles).
To put that number into context, that's around 6,900 times the distance between the Sun and Earth. Its orbit is 140 times wider than Pluto's. At that distance, the dim red dwarf star would look like just another moderately bright star in the sky.
Astronomer Simon Murphy from the Australian National University and his colleagues uncovered the secret relationship between the planet and star after noticing that they were both located 100 light-years from Earth. Further analysis showed they were moving together as well.
The planet is believed to be a gas giant 12 to 15 times the size of Jupiter, and takes nearly a million Earth years to circle its star.

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