Webb telescope reveals hidden young stars shaping nebula NGC 7129

By the Everything Space news desk · 06 Oct 2026 · written from the sources below

Image: Phys.org

Infrared imaging shows how stellar winds and outflows carve cavities and trigger new star formation in a nearby stellar nursery.

New infrared imagery from the James Webb Space Telescope has revealed previously hidden stars within NGC 7129, a star-forming region about 3,300 light-years from Earth. By capturing infrared light that can pass through dense dust, the telescope exposed stellar objects at various stages of formation, offering a rare look at how stars influence the gas and dust around them.

At the heart of the image is LkHalpha 234, the cluster's most massive and evolved star, with five to eight times the mass of the sun. It belongs to a class called pre-main-sequence stars, which have finished gathering mass and are now contracting and heating up before they begin fusing hydrogen like the sun.

To one side of this central star lies a large glowing cavity, roughly 3.5 light-years across, carved out by outflows from the star's earlier life stages. These outflows, combined with the star's radiation, heat the surrounding hydrogen gas, causing it to shine while also compressing some of the material into conditions favorable for new star birth. Within this cavity, younger pre-main-sequence stars generate their own winds, producing smaller bow shocks as they push against the surrounding gas.

The boundary where the hot stellar environment meets colder, denser gas forms what is known as a photodissociation region, where hydrogen molecules break apart into atoms. This process offers scientists a way to study how such molecular clouds erode over millions of years under the influence of forming stars.

On the opposite side of the image, a region of dense, clumpy gas conceals much younger stellar objects called protostars, which exist at an even earlier stage than pre-main-sequence stars. As these protostars gather mass, they release powerful outflows that collide with surrounding material, producing shocks and a textured, chaotic appearance. The overlapping outflows from multiple protostars contribute to the turbulent look of this part of the nebula, illustrating the dynamic and layered nature of star formation within the cluster.

Written in Everything Space’s own words by our news-desk model from the sources above, and checked against them in code: every number in this report appears in its sources, and no sentence is copied from them.