Brown dwarf or massive exoplanet detected with powerful magnetic field

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Brown dwarfs, objects that are two massive be considered planets but not massive enough to sustain nuclear fusion in their cores, were first predicted in the 1960s and detected for the first time in 1995. Some brown dwarfs have powerful auroras like those seen around the poles of Earth, Jupiter and Saturn caused by the interactions of a planet’s magnetic field and the electrically charged solar wind.

https://astronomynow.com/2018/08/04/26653/