Glowing Bridge Links Dwarf Galaxies In Stunning New Image From The James Webb Space Telescope

A spectacular new view of two dwarf galaxies caught in the middle of a cosmic collision reveals a glowing gas bridge, streams of newborn stars and the ongoing gravitational tug-of-war reshaping both galaxies.

Taken by the James Webb Space Telescope (JWST), the new image captures the dwarf galaxiesNGC 4490 and NGC 4485stretching, tugging and warping one another in a dramatic gravitational dance unfolding 24 million light-years away. Because dwarf galaxies closely resemble the low-mass, gas-rich, metal-poor systems that populated theearly universetheir collisions and gas exchanges provide a valuable window into how the first galaxies formed and evolved, according toa statementfrom the European Space Agency.

The largergalaxyNGC 4490, sprawls across the frame in a tangle of dust and newborn stars, dominating the left side of the image. Its smaller companion, NGC 4485, glows off to the upper right. Connecting them is a bright bridge of gas and dust embedded with clusters of newbornstarsshining blue against the reddish glow of warm interstellar dust. It is the interaction between the two galaxies that spurred a burst of new stars, according to the statement.

“Aside from the Milky Way’s own dwarf companions — theLarge and Small Magellanic Clouds— this is the closest known interacting dwarf-dwarf system where astronomers have directly observed both a gas bridge and resolved stellar populations,” ESA officials said in the statement.

While the galactic pair, collectively calledArp 269has been previously studied using observations from theHubble Space TelescopeWebb’s infrared vision has revealed the system in unprecedented detail. Using Webb’s Near-Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI), scientists now have an up-close view of individual stars and the fine structure of the gas flowing between the galaxies.

“By dissecting these galaxies star by star, researchers were able to map out where young, middle-aged, and old stars reside, and trace the timeline of the galaxies’ interaction,” ESA officials said.

Their analysis suggests thedwarf galaxiesswept past each other about 200 million years ago. During that encounter, NGC 4490 siphoned gas from its smaller partner, creating the visible bridge of exchanged material we see today and fueling waves of star formation — some of which kicked off as recently as 30 million years ago.

“By capturing the history of the galactic dancers NGC 4490 and NGC 4485, Webb has revealed new details in how dwarf galaxies interact, giving us a glimpse of how small galaxies near and fargrow and evolve,” ESA officials said in the statement.