Webb telescope spots a giant planet hidden in a well-studied star system

Astronomers have used NASA's James Webb Space Telescope to uncover a giant planet hiding inside one of the most closely studied planetary systems in the sky, according to research reported this month.

The planet had escaped detection because it was concealed by a bright disk of cosmic dust surrounding its host star. Such disks are the raw material from which planets form, but their glare can also mask worlds embedded within them. Webb's sensitivity to infrared light — the wavelengths where cool, distant objects shine — allowed researchers to see through the interference.

The discovery is a reminder of how much remains hidden even in systems that scientists believed they had mapped. Finding a large planet in a well-observed neighbourhood suggests that other worlds may be lurking, undetected, around nearby stars.

Beyond the single find, the result showcases why Webb has reshaped the study of planets beyond our solar system. Earlier telescopes could infer the presence of planets indirectly, often by watching for the tiny dip in starlight as a world passes in front of its star. Webb's ability to capture faint infrared signals lets astronomers study planets and the dusty disks around them more directly, teasing apart their structure and composition.

Each new detection helps refine the bigger picture of how planetary systems form and evolve — including the conditions that make some worlds rocky and others gas giants. Systems still wrapped in their birth disks are especially valuable, because they offer a snapshot of planet formation in progress.

Researchers say follow-up observations will aim to pin down the planet's mass, orbit and atmosphere. For now, the find underscores a theme that has run through Webb's mission since it began returning data: the universe, even in familiar corners, still has plenty left to reveal.