This Is the Most Detailed Image Yet of the Milky Way’s Center

The European Space Agency’s (ESA) Euclid space telescope has captured the largest and most detailed visible-light image ever obtained of the Milky Way’s galactic bulge, the central region of our galaxy. The image, which includes more than 60 million stars, was taken over 26 hours of observation and is a major advancement in galactic imaging. This development matters because it will significantly improve the detection and measurement of exoplanets through microlensing techniques and provide a valuable reference for future space missions.

The image was created from nine separate exposures taken by Euclid’s visible-light camera on March 23, 2025. Despite being designed primarily to observe distant galaxies, Euclid’s camera is sensitive enough to resolve individual stars in the densely populated and bright center of the Milky Way. Each exposure covers an area of sky larger than the full moon, and the combined mosaic surpasses the field of view of the Hubble Space Telescope by a factor of 270, with a speed that would require approximately 2,000 hours for the Keck Observatory to replicate.

According to an ESA press release, the image captures over 60 million stars, nebulae, and star clusters in a region ideal for studying exoplanets via gravitational microlensing. While the short observation window means Euclid did not detect new microlensing events, the data allows scientists to measure the masses of known exoplanets and prepare for future detections. The data also provides a baseline for upcoming missions such as the Nancy Grace Roman Space Telescope, set to launch later this year.

Impact of the Euclid Milky Way Image on Exoplanet Research

This image is a breakthrough for astronomers because it offers a detailed and expansive view of the Milky Way’s center, enabling more precise studies of exoplanets and stellar populations. The ability to measure planetary masses and study star motions in this crowded region enhances our understanding of galaxy dynamics and planetary systems. Additionally, the image serves as a crucial reference for upcoming microlensing surveys, improving detection accuracy and contributing to the broader field of galactic astronomy.

Background on Euclid’s Observation Capabilities and Galactic Imaging

Euclid was launched with the primary goal of mapping billions of distant galaxies to study dark matter and dark energy. Its visible-light camera, however, also possesses the sensitivity to resolve individual stars in the Milky Way’s dense core. Previous ground-based telescopes and space observatories like Hubble have captured images of this region, but Euclid’s wider field of view and faster imaging capabilities represent a significant technological advancement. The recent image builds on decades of microlensing research, which has discovered nearly 300 exoplanets, all observed toward the galaxy’s center using ground-based telescopes.

This new image represents a milestone, providing a detailed snapshot of a complex and crowded region of our galaxy, and supporting the ongoing search for exoplanets through gravitational microlensing techniques.

“The Euclid image includes 51 known planetary systems, and it will help us study many more yet to be discovered.”

— an anonymous researcher

Unresolved Questions About the Image’s Full Potential

While the image provides an unprecedented view of the Milky Way’s core, it is not yet clear how many new exoplanets or microlensing events will be identified from this data alone. The full extent of Euclid’s capabilities for ongoing exoplanet detection and the precise measurement of planetary masses in this densely populated region remains to be seen. Additionally, the impact of dust and stellar crowding on data accuracy is still being analyzed, and further observations are needed to confirm the full scientific potential of this dataset.

Upcoming Missions and Data Utilization for Galactic and Exoplanet Studies

Future observations by the Nancy Grace Roman Space Telescope, scheduled to launch later this year, will build upon Euclid’s data, using it as a baseline to detect new microlensing events. Researchers will analyze the Euclid dataset to refine models of stellar and planetary populations in the galactic center. Continued data processing and follow-up observations are expected to lead to the discovery of new exoplanets and improved understanding of the Milky Way’s structure and dynamics.

Key Questions

What makes Euclid’s image of the Milky Way unique?

It is the largest and most detailed visible-light image of the Milky Way’s core ever taken, covering an area 270 times larger than Hubble’s field of view in a single mosaic, and capturing over 60 million stars.

How will this image help in exoplanet research?

It provides a detailed reference that allows scientists to measure the masses of known exoplanets and prepare for future detections via microlensing, improving the accuracy of planetary studies.

Can Euclid detect new exoplanets with this data?

While Euclid’s short observation window did not allow for new detections, the data will support future missions and ongoing surveys to identify new exoplanets through microlensing events.

What are the next steps following this imaging achievement?

Upcoming missions like the Nancy Grace Roman Space Telescope will use Euclid’s data as a reference, and scientists will analyze the dataset to discover new planets and study galactic structure more deeply.

Source: WIRED