NASA’s Chandra Unveils a Stunning New Collection of Galactic Gems

Galaxies resemble cosmic gems, each distinguished by its size, shape, and other traits. A newly released gallery from NASA’s Chandra X-ray Observatory, complemented by data from other telescopes, presents a diverse array of galactic images that highlight this variety.

Astronomers classify galaxies into three primary types: spirals such as our Milky Way, featuring arms that extend from their cores; ellipticals, which are generally older and often result from mergers; and irregulars, which encompass a broad spectrum of galactic phenomena.

Just as gemstones reveal Earth’s geological history through their formation over billions of years, these galactic gems illuminate our galaxy’s context within the Milky Way. Observing other galaxies provides insight into our own, including clues about its past and future.

The gallery contains 16 new images, each incorporating X‑ray observations from Chandra accumulated over its decades‑long mission. These high‑energy data are blended with measurements from NASA’s James Webb and Hubble Space Telescopes, IXPE, the Neil Gehrels Swift Observatory, NuSTAR, and numerous ground‑ and space‑based instruments.

X‑ray observations are essential for understanding galaxies, exposing details invisible at other wavelengths. Chandra detects gas heated to millions of degrees by stellar winds, outflows from supermassive black holes, and remnants of exploded stars—key contributors to the elements that make up our bodies, atmosphere, and planet. It also captures the most energetic galactic phenomena, offering a comprehensive view of how galaxies form, interact, and evolve when combined with data across the electromagnetic spectrum.

Face‑on spirals like Messier 33 and NGC 3938 give clear views of sites where energetic star pairs and cosmic explosions reside along the arms. Barred spirals such as NGC 1672 and NGC 1385 illustrate how central bars of stars, gas, and dust channel material inward, triggering bursts of star formation. NGC 4725 shows how a prior galactic collision can spark new star formation. Meanwhile, edge‑on perspectives of NGC 4631 (the Whale Galaxy) and the starburst Messier 82 (the Cigar Galaxy) reveal vast halos and superwinds of million‑degree gas driven thousands of light‑years into space by intense stellar explosions, enriching the surrounding intergalactic medium with essential elements.

Active galactic nuclei—supermassive black holes at the hearts of galaxies—emit energy via outbursts and jets that affect entire galaxies. In Centaurus A, Chandra and IXPE data reveal a high‑energy particle jet extending tens of thousands of light‑years from its core. In Messier 106, black‑hole jets heat surrounding gas, generating spiral arms distinct from those in typical spirals. The iconic Sombrero Galaxy (Messier 104) harbors a massive black hole within a huge stellar bulge; Chandra’s X‑rays map a diffuse halo of million‑degree gas and hot stellar remnants encircling its prominent dust lanes.

The collection also highlights galaxies undergoing dramatic gravitational changes. A direct hit in Arp 143 acts like a cosmic bullseye, producing an expanding ring galaxy and igniting waves of star formation. Violent mergers such as NGC 3256 and the dust‑enshrouded starburst II Zw 096 illustrate the chaotic galaxy collisions that dominated the early universe and foreshadow the Milky Way’s future merger with Andromeda. NGC 1569 serves as a nearby laboratory for studying early‑universe starbursts, NGC 660 displays a rare polar‑ring galaxy where a stellar ring orbits over the poles, and Messier 90 depicts a spiral galaxy plunging through the Virgo Cluster, having its star‑forming gas stripped away.

NASA’s Marshall Space Flight Center oversees the Chandra mission, while the Smithsonian Astrophysical Observatory’s Chandra X‑Ray Center directs science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.

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