And we know this because astronomers have detected it using the Very Large Array radio telescope.
The newly identified planet was originally detected in 2016 in New Mexico, but was considered at that time to be a brown dwarf.
They're calling it a "rogue" planet because it appears to be travelling through space without any kind of orbit around a parent star. Hoverer, the new object generates a magnetic field 200 times a powerful as Jupiter's. Their findings were published this week, showing that this is the first time that the observatory's radio-telescope could detect the object outside our solar system.
Simultaneously, Dr. Kao's team observed SIMP0136 in a new study at even higher radio frequencies and confirmed that its magnetic field was even stronger than first measured - more than 200 times stronger than Jupiter's.
"This object is right at the boundary between a planet and a brown dwarf, or "failed star", and is giving us some surprises", Dr Melodie Kao and astronomer at Arizona State University told The Independent.
A brown dwarf is an object too large to be a planet, but isn't big enough to sustain the nuclear fusion of hydrogen in its core that is typical of stars.
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Apparently, it is said that all these signals come from the Milky Way but few of them are dated back to billions of years ago. Located in British Columbia, the new radio telescope heard a unusual signal through the noise.
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Another team looking at the brown dwarf data, discovered an object called SIMP J01365663+0933473, to be far younger than the others. However, solitary brown dwarfs do not have a solar wind from a nearby star to interact with. Scientists theorise that one possibility is having a planet or moon interact with the dwarf's magnetic field. The temperature on that planet is about 825 degrees Celsius, which makes it a lot cooler than out Sun.
Yet, all these unusual features still can't explain how the exoplanet got its incredibly strong magnetic field - a mystery that astronomers are still trying to crack.
A mysterious large object is floating around outside our solar system and researchers aren't sure exactly what it is - although it could be a rogue planet. Its age meant that instead of a "failed star", they had found a free-floating planet.
"We think these mechanisms can work not only in brown dwarfs, but also in both gas giant and terrestrial planets". Astronomers agree that the difference can be drawn as the line below which deuterium fusion is no more possible, known as the "deuterium-burning limit", it stands at around 13 Jupiter masses.
The unusually strong magnetic field "presents huge challenges to our understanding of the dynamo mechanism that produces the magnetic fields in brown dwarfs and exoplanets and helps drive the auroras we see", said Caltech's Gregg Hallinan.