NASA’s 16-image gallery maps black holes, star births and collisions

Combining X-rays with other observations helps astronomers connect hot gas to stars, dust and large-scale structures. The method separates what a galaxy contains from the processes currently moving energy and matter through it.

In plain terms, X-ray data locate the hottest gas, while the other observations show the stars and structures around it.

What powers star formation and giant outflows?

NGC 1672 and NGC 1385 are barred spiral galaxies. Their elongated central bars contain stars, gas and dust and can funnel material toward a galaxy’s inner regions. That supply can fuel intense periods of star formation.

NGC 4725 shows another route. An earlier encounter with another galaxy disturbed its gas and stimulated new stars, linking a past collision with present activity.

NGC 4631, the Whale Galaxy, and Messier 82, the Cigar Galaxy, contain enormous halos and powerful gas winds. Stellar explosions heat some of that gas to millions of degrees and push it thousands of light-years into space, spreading chemical elements into the space between galaxies.

In plain terms, galactic structure can concentrate gas into new stars, while stellar explosions push some of that material back out.

How do black holes reshape their galaxies?

A supermassive black hole is an enormously massive object at a galaxy’s center. When it actively consumes surrounding matter, its region can become an active galactic nucleus—a bright, energetic core that launches jets and powerful outbursts.

NASA’s gallery notes describe Centaurus A as showing “a powerful stream of high-energy particles shooting tens of thousands of light-years into space.” In Messier 106, jets from the central black hole heat surrounding gas and create unusual spiral structures unlike a spiral galaxy’s usual arms.

Chandra observations of the Sombrero Galaxy, Messier 104, reveal a broad halo of million-degree gas and the hot remains of stars around its central concentration. These features expose energetic activity beneath the galaxy’s recognizable dust bands.

In plain terms, black holes can heat nearby gas and drive particle jets far beyond a galaxy’s bright center.

What can collisions reveal about the Milky Way?

Arp 143 records a direct collision that produced an expanding ring and waves of star formation, resembling ripples spreading after an impact. NGC 3256 and II Zw 096 show how mergers can distort galaxies and trigger intense star formation. II Zw 096 hides much of that activity behind thick dust.

NGC 1569 helps astronomers study the intense star formation seen in young galaxies billions of years ago. NGC 660 has a rare polar ring, a structure of stars orbiting above and below the galaxy rather than within its main plane.

Messier 90 offers a different outcome. As it travels through the Virgo Cluster, the galaxy loses gas needed to form new stars, an example of how a cluster’s gravity can alter a galaxy’s future.

NASA says, “These collisions also offer clues about the Milky Way’s possible future.” Astronomers expect the Milky Way to merge with Andromeda in billions of years, but the gallery cannot provide an exact timetable or guarantee an identical sequence.

In plain terms, mergers can rearrange stars, trigger new births and sometimes remove the gas needed to form additional stars.

The 16 portraits present galaxies as changing systems shaped by gravity, explosions, black holes and encounters rather than fixed arrangements of stars.