Euclid’s galactic bulge survey

This six-gigapixel view of the galactic bulge is the largest high-resolution photo ever made of our Milky Way galaxy’s centre in visible light. It was taken on 23 March 2025 by the European Space Agency’s Euclid space telescope.

This version shows the full survey area, with edge effects from the 3x3 pointing pattern of Euclid's visible camera. Click here to download a square version of this image.

Euclid covered 4.8 square degrees of the sky with this image, corresponding to 22 times the area of the full Moon as seen from Earth. The image has been rotated counterclockwise compared to the celestial projection: north is to the left and east is down.

Read more about this image here.

Explore this image at the highest resolution in ESASky.

[Image description: A dense field of tiny stars fills this wide image taken by the European Space Agency’s Euclid space telescope. The image has an irregular, patchwork shape, with jagged edges and black gaps around the borders. The lower and central areas are dominated by bright yellow and gold colours, forming a textured background similar to fine glitter or sand. Dark brown and black patches cut irregularly through the yellow regions, like ink stains or clouds of smoke. Across the upper part of the image, the colours shift to deeper brown, reddish, and purplish tones, blending into the surrounding star field. Small blue points of light are scattered across the image.]

Technical details:

The Euclid galactic bulge survey was conducted in early 2025 using Euclid’s optical camera VIS (monochromatic, one colour). These are first and foremost Euclid images, defined by Euclid’s crisp resolution and spectacularly wide field of view; the colours were added using observations captured in the summer of 2025 with the Canada-France-Hawai'i Telescope's MegaCam camera (CFHT-Megacam) in Hawai’i. The colours captured by MegaCam are in optical light through three broad-band filters (u, g, and r) overlapping the very broad VIS band over the r-band. The appearance of the most luminous stars in these images looks different than those generated from Euclid-only images, with additional diffraction spikes and a subtle halo around the very bright stars. This a consequence of combining Euclid VIS data, for their sensitivity and sharpness, and CFHT-MegaCam for the colours. Subtle differences in optical design of the two telescopes become apparent for the brighter objects.