TRAPPIST-1 and its compact system of temperate rocky planets

Understand

The TRAPPIST-1 system is comprised of seven Earth-sized rocky planets in small orbits around a Jupiter-sized ultracool dwarf star 12 parsec away.

• These planets cover an irradiation range similar to the range of the inner solar system.
• Three of them orbit within the circumstellar habitable zone.
• All of them are particularly well-suited for detailed characterization, thanks to the small size of and to the infrared brightness of the host star, and to the system's compact resonant structure.