The Trappist-1 planetary system located about 40 light years away in the constellation of Aquarius consists of a small red dwarf star and 7 Earth sized planets. By carefully studying changes in the planet's transit timings and the shape of the dip in the host star's brightness as each planet transits across it, astronomers have been able to measure the orbital period, radius, and approximate mass for each of the 7 planets. Dr Billy Quarles of the University Oklahoma and his team used thousands of numerical simulations on super computers to investigate the range in each planet's parameters which would cause it to have a stable orbit and would thus produce the Trappist-1 solar system which we see today. Their results, published in the Astrophysical Journal Letters suggests that 6 of Trappist-1's planets have rocky composition like the Earth the remaining one may be composed of 25 % water by mass compared to 0.02% water by mass for Earth. The next step will be to use the James Web Space Telescope equipped with the latest scientific instruments to study the atmospheres of these distant worlds.
