One of these in Lepus became the prototype for the T spectral class.
One of these in Lepus became the prototype for the T spectral class. They can be distinguished from low-mass stars because of their lithium content and from high-mass (*) planets by their density and x-ray spectra. Lying in spectral classes M, L, and T, for 10 points— identify these astronomical objects which are failed stars that lack the mass to initiate thermonuclear fusion.
One of these in Lepus became the prototype for the T spectral class.
brown dwarf