The James Webb Space Telescope (JWST) has taken a fresh look at the cosmos, revealing galaxies we’ve never seen before. This new observation builds on the remarkable Hubble Ultra Deep Field image released in 2004, which stunned astronomers worldwide. That image combined 800 photos over 11 days, uncovering nearly 10,000 galaxies in an unassuming area of the night sky.
Recently, JWST found an additional 2,500 objects in that same patch, including even more distant galaxies. This project, named the MIRI Deep Imaging Survey (MIDIS), is the deepest mid-infrared image of that section of the sky.
After almost 100 hours of observation using its Mid-Infrared Instrument (MIRI) and Near-Infrared Camera (NIRCam), JWST captured breathtaking images. Among them are galaxies that might date back to just a billion years after the Big Bang.
The standout feature of this new image is its ultra-long exposure. JWST used one of MIRI’s filters for a continuous 41-hour capture of the night sky, the longest of any extragalactic field to date. This technique allowed it to reveal galaxies in mid-infrared light—wavelengths invisible to both Hubble and the human eye—along with previously unseen dust and ancient stars.
To make sense of this invisible light, scientists apply filters that assign colors to different wavelengths. In this image, galaxies filled with dust and forming new stars appear in orange and red, distant compact galaxies look greenish, and galaxies shining brightly in near-infrared light appear blue and cyan.
A study about these findings was published in the journal Astronomy & Astrophysics. Research teams have shared comparisons with the Hubble images through interactive sliders and videos, allowing us to see the striking differences.
This research not only expands our understanding of the early universe but highlights how far we’ve come in exploring space. For decades, astronomers relied on Hubble’s observations. Now, JWST is pushing those boundaries further than ever, opening a window into our cosmic past.
As we continue to explore the unknown, it’s incredibly exciting to think about what we’ll discover next. Will we find more about the formation of stars and galaxies or perhaps even clues about the first moments of the universe? The possibilities are endless!
