The planet is rocky and almost precisely the same size as Earth, but whips around its star in only two days.

A second Earth-sized world is found in habitable zone of a star with three previously known planets.

A previously discovered "hot Jupiter" appears to be spiraling into its star, new data shows.

Two exoplanets orbiting a red dwarf star may be "water worlds." They are 218 light-years away in the constellation Lyra, and are unlike any planet found in our solar system.

Webb's firsts keep coming: Observations of the exoplanet WASP-39 b show fingerprints of atoms and molecules, as well as signs of active chemistry and clouds.

New observations show that a previously identified exoplanet, TOI-1075 b, is among the most massive super-Earths found so far.

A new study of the "super-Earth" GJ 1252 b shows that the planet likely has a very minimal atmosphere or, possibly, no atmosphere at all.

A newly discovered 'super-Earth' lies in the habitable zone around its star, and appears to be in a prime position for further atmospheric investigation.

Webb ushers in a new era of exoplanet science with the first unequivocal detection of carbon dioxide in a planetary atmosphere outside our solar system.

A "super-Earth" discovered using the TESS satellite might be a "water world," though more observations are needed.

The James Webb Space Telescope will examine the "lives" of exoplanets, from formation through maturity and eventual demise.

Webb captured the distinct signature of water, along with evidence for clouds and haze, in the atmosphere surrounding a hot, puffy gas giant planet orbiting a distant Sun-like star.