Climate of Earth-like rocky exoplanets mapped for first time
Utilising the James Webb space telescope(JWST), an international team has mapped the climate of rocky exoplanets with masses similar to Earth in the TRAPPIST-1 system. First discovered in 2000, TRAPPIST-1 is a red dwarf star and is thought to be about 3 billion years older than the Solar System. Further discoveries in 2016 and 2017 identified at least seven exoplanets in the star’s orbit, all likely tidally locked and with circular orbits between 1.5 and 19 days. At least four of the planets in TRAPPIST-1’s orbit- TRAPPIST-1d, TRAPPIST-1e TRAPPIST-1f and TRAPPIST-1g- are considered potentially hospitable to life, as their orbital distance allows the existence of liquid water, although there is no evidence of atmospheres on any of the planets in the system. The two planets studied, TRAPPIST-1b and TRAPPIST-1c, are believed to have temperatures differences at day and night in excess of 500 degrees Celsius and so likely do not have atmospheres. “The TRAPPIST-1 system is incredible! Seven planets, some with masses similar to Earth’s, orbit the same star. At least three planets are located …



