NASA’s Astronomy Picture of the Day for May 22, 2026 stopped me in my tracks. It shows a glowing ring of ionized gas floating in the constellation Cygnus, sculpted over thousands of years by one of the most extreme stars in the Milky Way. This is the nebula around Wolf-Rayet star WR 134, and it is as dramatic as it looks.
What Are We Actually Looking At?
The image, captured by astrophotographer Luigi Morrone using narrowband
filters, covers a patch of sky more than twice as wide as the full Moon. What
makes it special is what those filters reveal: the faint, ring-like shell of
ionized hydrogen and oxygen gas that surrounds WR 134, glowing in the
characteristic colors of a star that is effectively blasting its own
neighbourhood apart.
WR 134 sits roughly 6,000 light-years away from Earth, meaning the entire frame spans more than 100 light-years across. The bright star near the center of the image, that is WR 134 itself, the engine behind everything you see.
Wolf-Rayet Stars: The Universe’s Most Extreme Suns
Wolf-Rayet stars are among the rarest and most violent objects in the
galaxy. As of the last comprehensive survey, fewer than 200 had been identified
in the entire Milky Way. They are what happens when a massive star, typically
more than 20 times the mass of the Sun, burns through its hydrogen fuel so fast
that it begins stripping away its own outer layers.
What is left
is a bare, searingly hot core. WR 134 has a surface temperature exceeding 63,000
Kelvin, roughly ten times hotter than the Sun, and pours out around 400,000
times the Sun’s luminosity. Despite being only about five times the Sun’s
physical size, it radiates energy at a rate that is almost incomprehensible.
That energy drives a ferocious stellar wind: a continuous outflow of material blasting outward at thousands of kilometres per second. Over time, this wind sweeps up the surrounding interstellar gas and dust into an expanding bubble, the very structure we see glowing in the image. The nebula around WR 134 was first noticed in 1971 and is embedded within the larger emission complex known as Sh2-109, which gives the surrounding region its rich, textured glow.
A Star Writing Its Own Obituary
Here is the
sobering part: Wolf-Rayet stars do not live long. By stellar standards, they
are burning at an unsustainable rate, and their fate is sealed. When WR 134
finally exhausts the last of its nuclear fuel, it will end in a core-collapse
supernova, one of the most energetic events in the known universe.
When that happens, the explosion will scatter heavy elements, carbon,
oxygen, iron, and more, across the surrounding interstellar medium. Those same
atoms will eventually find their way into new clouds of gas and dust, and in
time, into new stars and planets. The nebula we are admiring today is, in a
very real sense, a preview of tomorrow’s raw material.
As the APOD description puts it, Wolf-Rayet stars “enrich the interstellar material with heavy elements to be incorporated in future generations of stars.” We are, quite literally, made of the debris of stars like WR 134 that exploded billions of years ago.
Why the Image Looks the Way It Does
The striking
colors in Morrone’s photograph are not what your eye would see through a
telescope. They come from narrowband filters that isolate the
light emitted by specific elements, hydrogen-alpha (H-alpha) for the red tones,
and doubly ionized oxygen (O III) for the blue-green hues. This technique
strips away the noise of broader light pollution and background glow, revealing
delicate structures that would otherwise be invisible.
The result is a portrait of physics in action: a stellar wind slamming into interstellar gas, compressing it into a thin glowing shell, and exciting the atoms within it to emit light. The off-center, asymmetric shape of the ring reflects the uneven density of the surrounding medium — the wind pushes further where the gas is thinner, and stalls where it encounters denser clouds.
Finding WR 134 in the Sky
WR 134 lives
in Cygnus, the Swan, one of the richest constellations for deep-sky
observers in the Northern Hemisphere. It sits less than a degree from its
neighbour WR 135, and both stars are thought to lie within the same stellar
association, Cygnus OB3. Just a few degrees away is the famous Crescent Nebula
(NGC 6888), powered by another Wolf-Rayet star, WR 136. If the Crescent is the
showpiece of the region, WR 134’s nebula is the quieter, more subtle reward for
patient observers with the right filters.
The bubble is best seen in O III, requires dark skies, and rewards long
exposure times. But the effort is worth it. There is something remarkable about
looking at a star in its final chapter and seeing the cosmos already preparing
for what comes next.
Image Credit
& Copyright: Luigi Morrone and
Telescope Live; Featured on NASA Astronomy Picture
of the Day, May 22, 2026.
Further reading: Esteban et al. (1995), “Nebula around WR 134,” Astronomy & Astrophysics, 304, 491. Available via the NASA Astrophysics Data System (ADS).
Source: A Star on the Edge of Destruction, The Haunting Beauty of WR 134 – Scents of Science
