Planets are formed when discs of material orbit around a star and coalesce. But it's always been a mystery what happens to them when a star dies or whether it's possible for one to form outside of a solar system.
So-called Rogue planets have long been a top target for researchers. But the fact that if they exist would be in the deep recesses of space without any light sources it's almost impossible to actively search for them.
In 2017 though astronomers announced the first such discovery a planet called Simp0136. It's a brown dwarf so it's somewhere between a planet like we normally think of them and a star and it's thought to be around 12 times the size of Jupiter thought to have originated in a nearby group of stars.
But there's one thing that's particularly stood out about this discovery. Researchers noticed that it produced its own Auroras similar to the ones that we see on earth.
Which meant that it must have its own magnetic field wasn't known for sure whether this was possible especially for an object that had been adrift for so long, but the mechanisms behind its occurrence are still not understood.
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