Ultra-cool dwarf

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

Main topics

Terrestrial	Carbon planet Coreless planet Desert planet Dwarf planet Ice planet Iron planet Lava planet Mega-Earth Ocean planet Sub-Earth Super-Earth

Gaseous	Chthonian planet Eccentric Jupiter Gas dwarf Helium planet Hot Jupiter Hot Neptune Cold Neptune Ice giant Mini-Neptune Super-Jupiter

Other types	Brown dwarf Circumbinary planet Double planet Mesoplanet Planemo Planetesimal Protoplanet Pulsar planet Sub-brown dwarf Ultra-cool dwarf

Formation and
evolution

Catalogues

Other

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