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.

Two newly discovered "super-Earths" are rocky worlds – and could be ideal candidates for follow-up atmospheric observations.

The detection of 30 comets in another solar system – exocomets – could shed light on the formation of our own system of planets.

An international team of astronomers confirms 60 new exoplanets, or planets orbiting other stars; a separate study finds tentative evidence of an “exomoon.”

The count of confirmed exoplanets just ticked past the 5,000 mark, representing a 30-year journey of discovery led by NASA space telescopes.

Scientists will be able to measure a specific kind of space dust in nearby planetary systems’ habitable zones. Finding out how much of this material these systems contain would help astronomers learn more about how rocky planets form and guide the search for habitable worlds.

NASA announced the discovery of seven Earth-size worlds orbiting the TRAPPIST-1 star five years ago. We've learned more in the years since, and we'll get an unprecedented look with the James Webb Space Telescope.

The atmosphere of a "super Neptune" some 150 light-years distant contains water vapor, a new study shows.

NASA's James Webb Space Telescope is in space! How long will it take to fully deploy and get into configuration?