Brown dwarfs are failed stars, never igniting their hydrogen fusion.

Name: Brown dwarfs are failed stars, never igniting their hydrogen fusion.
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Brown dwarfs are too small to ignite hydrogen fusion in their cores, which is necessary for them to become full-fledged stars. Therefore, they are considered failed stars. Brown dwarfs are often referred to as "failed stars" because they do not have enough mass to ignite and sustain hydrogen fusion in their cores, which is what powers stars.

Brown Dwarfs Are Failed Stars, Never Igniting Their Hydrogen Fusion