NASA - National Aeronautics and Space Administration - Mysterious objects called brown dwarfs are sometimes called "failed stars"

Mysterious objects called brown dwarfs are sometimes called "failed stars".

They are too small to fuse hydrogen in their cores, the way most stars do, but also too large to be classified as planets. 

New study suggests they create powerful auroral displays, similar to the kind seen around the magnetic poles on Earth. 

Details: http://go.nasa.gov/1N2l146‪#‎NASABeyond‬