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"Free-floating, non-deuterium-burning, substellar objects" are isolatedbodies of a few Jupiter masses found in very young open clusters andassociations, nearby young moving groups and in the immediate vicinity of theSun. They are neither brown dwarfs nor planets. I look over their nomenclature,history of discovery, sites of detection, formation mechanisms and futuredirections of research. Most free-floating, non-deuterium-burning, substellarobjects share the same formation mechanism as low-mass stars and brown dwarfs,but there are still a few caveats, such as the value of the opacity mass limit,the minimum mass at which an isolated body can form via turbulent fragmentationfrom a cloud. The least massive free-floating substellar objects found to datehave masses of about 0.004 Msol, but current and future surveys should aim atbreaking this record. For that, we may need LSST, Euclid and WFIRST.

A review on substellar objects beyond the deuterium burning mass limit: planets, brown dwarfs or what?