Astronomers have discovered the exoplanet TOI-270 d, 70 light-years away, using the James Webb Space Telescope.

TOI-270 d is an exoplanet twice the size of Earth, potentially featuring a surface covered by a boiling ocean.

The planet's atmosphere contains water vapor, methane, and carbon dioxide, suggesting a water world but it may suffer from a runaway greenhouse effect.

It is tidally locked, leading to extreme temperature differences between its day and night sides.

The presence of carbon disulphide, a molecule associated with biological processes on Earth, was detected but habitability remains uncertain.

The discovery showcases the James Webb Space Telescope's ability to analyze exoplanetary atmospheres and hints at its potential for future atmospheric characterizations of temperate low-mass exoplanets.