A cloud fragment too small to collapse into a main sequence star becomes a:

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A cloud fragment that is too small to collapse into a main sequence star becomes a brown dwarf, which is often called a failed star. It is not massive enough to sustain nuclear fusion in its core, but it is still larger than a gas giant planet. A cloud fragment too small to collapse into a main sequence star becomes a brown dwarf. Brown dwarfs are sometimes referred to as "failed stars" because they have enough mass to fuse deuterium in their cores, but not enough to sustain the fusion of hydrogen, which is what powers main sequence stars. Brown dwarfs are often referred to as "substellar objects" and can have some planet-like characteristics.

A Cloud Fragment Too Small to Collapse into a Main