Ultra-cool dwarf
From Infogalactic: the planetary knowledge core
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File:Comparison between the Sun and the ultracool dwarf star TRAPPIST-1.jpg
Size comparison of a TRAPPIST-1 an ultra-cool dwarf and the Sun.
An ultra-cool dwarf is a stellar or sub-stellar object of spectral class M that has an effective temperature under 2,700 K (2,430 °C; 4,400 °F).[1] TRAPPIST-1 is an example of an Ultra-cool dwarf.[1]
References
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