What category describes objects less massive than $0.08 M_{\odot}$?
Answer
Brown dwarfs
Objects possessing less mass than approximately $0.08$ times the mass of the Sun ($0.08 M_{\odot}$) do not accumulate enough gravitational pressure in their cores to initiate and sustain the nuclear fusion of hydrogen. Because they cannot maintain this primary energy generation process characteristic of true stars, they are classified specifically as brown dwarfs, which are often referred to as substellar objects.
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