Two Breakthrough JWST Discoveries Reveal Water Near Sagittarius A* and a Hidden Arc from the Early Universe

"The detection of water is especially exciting because it shows that molecular material can survive in an environment dominated by intense radiation," said team member Macarena Garcia Marin .

The finding implies that evolved stars near galactic centers can still supply the raw building blocks — dust and water — for future generations of stars and planets, even in what was long assumed to be too hostile an environment for such chemistry .

Discovery 2: A Hidden Gravitational Arc from the Early Universe

Astronomer Homer Dávila Gutiérrez (SKYCR.ORG) systematically searched 54 public JWST/NIRCam fields, evaluating 1,591 extended sources, and identified a new strong gravitational arc candidate — designated A1 — behind the massive galaxy cluster MACS J0308.9+2645 .

The arc is highly elongated (axis ratio ~6.5), curved, and tangentially aligned. Its six-band photometry yields a photometric redshift of z ≈ 4.4, meaning the background galaxy is seen when the universe was less than 1.5 billion years old . A fainter secondary candidate (A2) was also reported.

Remarkably, the arc was not present in any existing database (SIMBAD, NED, VizieR) and was missed in earlier Hubble-based analyses of the same cluster . It was found not through a dedicated new observation, but by re-analyzing already-public JWST imaging from programme GO-5293 using a simple, transparent catalogue-based search method .

What These Two Discoveries Reveal

Webb's archive is a treasure trove that's barely been touched.

The gravitational arc discovery demonstrates that a high-redshift lensed galaxy was hiding in plain sight across 54 fields, missed by both HST-era work and previous JWST processing. As the paper notes, the arc is absent from all major astronomical databases — underscoring how much discovery potential remains in data already downloaded .

Molecular material is more resilient than we thought.

The IRS 3 detection shows that dust grains and water molecules can form and survive within half a light-year of a supermassive black hole — a region long assumed to be too harsh for such chemistry. This changes our understanding of where the building blocks of planets can exist in a galaxy .

Together, the two discoveries reinforce that Webb's combination of deep archival data and exquisite infrared sensitivity is enabling breakthroughs both in the distant early universe and in our own cosmic backyard — often from data that was already sitting in public repositories.