IPAC Logo

Euclid: An ESA Mission With NASA Participation

Studying the Geometry and Nature of the Dark Universe

Euclid and ENSCI

Euclid is a European Space Agency (ESA) space mission with NASA participation, to study the geometry and nature of the dark Universe. Euclid will carry out a six-year survey of a third of the sky in the optical and near-infrared. It will measure galaxies out to distances corresponding to a look-back time of ~10 billion years. Euclid was launched on July 1, 2023. Well-characterized and validated Euclid data will be publicly released within about 2 years of acquisition.

Euclid NASA Science Center at IPAC (ENSCI) has been established by NASA, in order to support US-based investigations using Euclid data. ENSCI is part of the Euclid Consortium’s Science Ground Segment, providing algorithm and software development, participating in data quality assurance, and performing data processing. In addition, ENSCI supports the US research community by providing expert insight into the Euclid surveys, data processes, calibration, and products.

Request help from ENSCI

Latest News

Euclid Galactic Bulge Survey

Red jagged square shows the coverage of the Euclid Galactic Bulge Survey (in red), on a Gaia image of the Milky Way (showing star light and dark dust).

Euclid Galactic Bulge Survey

October 16th, 2025

Euclid Galactic Bulge Survey covers the region that the Roman Galactic Bulge Time Domain Survey will observe over 5 years, enabling powerful synergies to maximize science from the Roman survey.

Euclid DR1 coverage

The planned Euclid DR1 data release sky coverage (marked in blue), overlaid on the Gaia Early Data Release 3 (EDR3) all sky color image. The green area marks the 14,000 sq deg Euclid Wide Survey.

Euclid DR1 coverage

October 9th, 2025

ESA has released the planned sky coverage of the much-anticipated first public data release from Euclid Wide Survey, Data Release 1 (DR1).

ESA workshop on Euclid Q1 data

Detail of ESA workshop poster on Euclid Q1 data, including text, and a collage of galaxy images from Euclid data.

ESA workshop on Euclid Q1 data

October 2nd, 2025

European Space Agency (ESA) will have a workshop on "Working with Euclid Q1: From Data Access to Science Workshop", December 1-3, 2025, in Spain. It is open to all researchers!

Euclid Science

Our Universe is undergoing an accelerated expansion. Since matter gravitates, cosmic expansion would slow down in a matter-dominated universe. Thus the unknown nature of the observed cosmic acceleration has been dubbed “dark energy”. Euclid will map the large-scale structure of the Universe over ~15,000 square degrees, nearly half of the full sky excluding the regions dominated by the stars in our Milky Way galaxy. It will measure galaxies out to distances which corresponds to a look-back time of ~10 billion years, covering the period over which dark energy accelerated the expansion of the Universe.

Learn more

Euclid Science

Our Universe is undergoing an accelerated expansion. Since matter gravitates, cosmic expansion would slow down in a matter-dominated universe. Thus the unknown nature of the observed cosmic acceleration has been dubbed “dark energy”. Euclid will map the large-scale structure of the Universe over ~15,000 square degrees, nearly half of the full sky excluding the regions dominated by the stars in our Milky Way galaxy. It will measure galaxies out to distances which corresponds to a look-back time of ~10 billion years, covering the period over which dark energy accelerated the expansion of the Universe.

Learn more

Euclid Mission

Euclid is an ESA space mission with NASA contribution. It will study the geometry and nature of the dark Universe. Euclid will carry out a 6 year survey of ~1/2 of the extragalactic sky in the optical and near-infrared, accurately measuring shapes for ~1.5 billion galaxies, and redshifts (i.e., distances) of ~30 million galaxies. All data will be released to the world-wide community within about 2 years of acquisition.

Learn more

Euclid Data

All Euclid data will be made public in three major data releases (DR1, DR2, DR3), phased with the survey progress, with the final DR3 a year after the end of the main survey. Preceding each major DR are “quick releases” (Q1, Q2, Q3, Q4) of selected areas and data-products, to demonstrate the data to be expected, and to allow scientists to sharpen their data analysis tools. Well-characterized and validated data will be released via ESA’s Euclid Science Archive System, and by the NASA/IPAC Infrared Science Archive.

Learn more

Euclid Data

All Euclid data will be made public in three major data releases (DR1, DR2, DR3), phased with the survey progress, with the final DR3 a year after the end of the main survey. Preceding each major DR are “quick releases” (Q1, Q2, Q3, Q4) of selected areas and data-products, to demonstrate the data to be expected, and to allow scientists to sharpen their data analysis tools. Well-characterized and validated data will be released via ESA’s Euclid Science Archive System, and by the NASA/IPAC Infrared Science Archive.

Learn more

Featured Links

Euclid @ ESA
Euclid Consortium
Euclid @ NASA