Ultra-cool dwarf
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An ultra-cool dwarf is a stellar or substellar object that has an effective temperature lower than 2,700 K. This category of dwarf stars was introduced in 1997 by J. Davy Kirkpatrick, Todd J. Henry, a
Size comparison of the Sun (left) and TRAPPIST-1 (an ultra-cool dwarf)
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TRAPPIST-1
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TRAPPIST-1 is a red dwarf star with seven known exoplanets. It lies in the constellation Aquarius approximately 40.66 light-years away from Earth. An ultra-cool dwarf, it has a surface temperature of
Ultra-cool dwarf
…Altogether, ultra-cool dwarfs represent about 15% of the astronomical objects in the stellar neighborhood of the Sun. One of the best known examples is TRAPPIST-1. Models of the formation of planets suggest that due to their low masses and the small size of their proto-planetary disks, these stars could host a…
Comparison of the orbits of the TRAPPIST-1 planets with the Solar System and Jupiter's moons
Relative sizes, densities and illumination of the TRAPPIST-1 system compared to the inner planets of the Solar System
Habitable zones of TRAPPIST-1 and the Solar System. The displayed planetary surfaces are speculative.