On June 24, 2026, the European Space Agency’s Euclid mission — with a little help from NASA — released a jaw-dropping new image of the Milky Way’s core. And it’s not just pretty. This single frame captures over a million stars, swirling gas clouds, and the chaotic dance happening just 25,000 light-years from Earth. The image covers a patch of sky that overlaps with a region NASA’s Nancy Grace Roman Space Telescope will study when it launches later this decade. Scientists are already calling it a preview of what’s to come.
Euclid launched in July 2023 on a six-year mission to map the dark universe — dark matter and dark energy — by observing billions of galaxies across cosmic time. But along the way, it’s also giving us the sharpest-ever wide-field views of our own galaxy. The new image, taken with Euclid’s VISible instrument (VIS), shows the galactic plane in stunning detail. Think of it as a census of the Milky Way’s downtown district — crowded, messy, and absolutely fascinating.
“This is like taking a high-resolution photo of a city from space and being able to count every window,” says Dr. Sarah Kendrew, Euclid instrument scientist at the European Space Agency. “We’re seeing stars that are typically hidden behind curtains of dust, because Euclid observes in visible and near-infrared light.” Indeed, the image cuts through the interstellar haze that obscures our view from Earth, revealing structures we’ve only glimpsed before.
Why the Galactic Center Matters
The heart of the Milky Way is a unique laboratory. It’s home to a supermassive black hole — Sagittarius A* — with a mass of about 4 million Suns. But the region is far more than just a black hole. It’s a dense stellar nursery where stars are born at rates much higher than in the galactic suburbs. It’s also a place where dark matter should be concentrated, making it a key target for Euclid’s primary mission.
By mapping the positions and motions of stars in this crowded field, astronomers can trace the gravitational pull of both visible matter and invisible dark matter. The new Euclid image covers an area roughly the size of 300 full Moons on the sky — a vast swath that will help researchers build a 3D map of the inner galaxy. “We’re not just taking a pretty picture,” says Dr. Jason Rhodes, a NASA project scientist for Euclid at the Jet Propulsion Laboratory. “We’re collecting data that will let us test our models of galaxy formation and dark matter distribution right here in our own backyard.”
It’s a rare opportunity. Most dark matter studies rely on distant galaxies or the cosmic microwave background. But the Milky Way’s center offers a nearby, high-resolution laboratory. And because Euclid observes in both visible and near-infrared light (through its NISP instrument), it can see through the dust that blocks optical telescopes on Earth. That’s a game-changer.
A Cosmic Collaboration with Roman
The overlap with NASA’s Nancy Grace Roman Space Telescope is no accident. Roman, set to launch no earlier than 2027, will have a field of view 100 times larger than the Hubble Space Telescope. It will survey the same region of the galactic plane in infrared, complementing Euclid’s visible-light data. Together, they’ll create the most complete multiwavelength portrait of the Milky Way’s center ever attempted.
“Roman will see even deeper into the dust, revealing stars Euclid can’t,” explains Dr. Rhodes. “And Euclid gives us the visible-light context. It’s like having two different pairs of eyes — one that sees color, one that sees heat.” This synergy is critical for understanding star formation, stellar populations, and the dynamics of the galactic bulge. And it’s not just about stars: the data will also help pinpoint microlensing events — when a foreground star briefly magnifies a background star — which can reveal exoplanets and even rogue planets.
Interestingly, the way Euclid processes color in its images is a feat of engineering. The instrument uses a filter wheel to capture different wavelengths, then combines them into the stunning false-color images we see. It’s a reminder that our understanding of color itself has deep roots in atomic physics — a connection that spans from the lab to the cosmos.
What the Image Actually Shows
Let’s zoom in. The new Euclid image — released alongside a scientific paper in Astronomy & Astrophysics — reveals a dense field of stars, many of which are red giants and supergiants. You can see dark lanes of dust snaking through the field, regions where new stars are forming, and the bright glow of ionized gas. The image also captures globular clusters — ancient balls of stars that orbit the galactic center — and faint tidal streams, the shredded remains of smaller galaxies that have been torn apart by the Milky Way’s gravity.
One particularly striking feature is a region called the “Brick” — a dense molecular cloud that’s surprisingly inefficient at forming stars. Astronomers aren’t sure why. Euclid’s sharp view might help solve that puzzle. “We’re seeing structures at resolutions that were impossible from the ground,” says Kendrew. “The Brick is a classic mystery, and Euclid is giving us the data to crack it.”
The image also shows thousands of variable stars — stars that change brightness over time. By tracking these, scientists can measure distances across the galaxy with high precision. That’s essential for mapping the 3D structure of the Milky Way’s bar and spiral arms.
What Comes Next
Euclid’s survey of the galactic plane will continue over the next few years, covering an area of about 1,500 square degrees — that’s roughly 7,500 times the area of the full Moon. The data will be released in stages, with the first major public data release expected in 2027. By then, Roman will be gearing up for its own observations. The combination promises to revolutionize our understanding of the Milky Way’s past, present, and future.
And for those of us who just love a good space photo? This is only the beginning. Euclid has already returned stunning images of the Perseus Cluster, the Horsehead Nebula, and dozens of distant galaxies. Each release peels back another layer of the cosmos. As Kendrew puts it: “Every time we think we’ve seen the best image Euclid can take, it surprises us again.”
So stay tuned. The heart of our galaxy is beating, and Euclid has its finger on the pulse.
Frequently Asked Questions
What is the Euclid mission?
Euclid is a European Space Agency mission launched in July 2023, with contributions from NASA. Its primary goal is to map the geometry of the dark universe — dark matter and dark energy — by observing billions of galaxies. It carries a 600-megapixel visible-light camera and a near-infrared spectrometer and photometer.
How does this image help study dark matter?
By precisely measuring the positions and shapes of stars in the crowded galactic center, scientists can detect subtle gravitational distortions caused by dark matter. The image provides a baseline for understanding how mass is distributed in the inner galaxy, which tests dark matter models.
When will the Nancy Grace Roman Space Telescope launch?
NASA’s Nancy Grace Roman Space Telescope (formerly WFIRST) is currently scheduled to launch no earlier than 2027. It will observe in infrared light and have a field of view 100 times larger than Hubble, making it an ideal partner for Euclid in surveying the Milky Way’s center.
