- It is an ultra-cool dwarf star about 40 light years away, located in the constellation Aquarius.
- It is named after the telescope that discovered this system – TRAPPIST (Transiting Planets and Planetesimals Small Telescop) in Chile.
- The planets have sizes and masses comparable to the Earth and Venus.
- It is an ultra-cool star (unlike our sun). Therefore, liquid water could survive on planets very close to it as well.
- All 7 planetary orbits are closer to their host star than Mercury is to our sun. The planets are very close to each other.
- Based on their densities, the planets of this system are likely to be rocky.
- The TRAPPIST-1 star is quite old: between 5.4 and 9.8 billion years. This is up to twice as old as our own solar system, which formed some 4.5 billion years ago.
- Since it is a low mass star, the temperature and brightness almost remains constant. Therefore, it is expected to live 900 times longer than the current age of the universe – 13.7 billion years.