A space mission to map the Dark Universe


Euclid is a space-borne survey mission dedicated to investigate the origin of the Universe's accelerating expansion and the nature of dark energy, dark matter and gravity. Euclid will characterise the signatures of dark energy on the 3D distribution of cosmic structures. In 2012, Euclid was approved as the second Medium Class mission (M2) in the Cosmic Vision Programme. Launch is scheduled in 2023.

Watch the Euclid model in 3-D !

The mission is optimised to measure apparent shapes of galaxies, which are distorted by gravitational deflection of light due to dark matter concentrations, and to measure galaxy clustering, that is the non-random distribution of galaxies in the Universe resulting from the action of gravity. Euclid demands very high precision measurements and the ability to survey the sky at visible and near-infrared (NIR) wavelengths. Such requirements cannot be met from the ground, and calls for a wide-field Visible/NIR space mission. For more information see our SciTech site, and in particular the "red book"

The sky covered by Euclid

During its nominal mission of 6 years, Euclid will survey more than 14000 deg2 of extragalactic sky. The image above is the Euclid reference survey fulfilling all mission specifications. The image is a Mollweide projection of the entire sky in ecliptic coordinates, the ecliptic North pole is up. The ecliptic plane (horizontal band) and the galactic plane (u-shaped band) are avoided due to sky background disturbance. Different colours indicate different years during the survey (image courtesy Euclid Consortium).

latest news on Euclid on Twitter: @ESA_Euclid

EVENTS and Announcements


25-29 April 2022 2022 annual consortium meeting (Oslo)
25-28 May 2021 2021 annual consortium meeting (Lausanne, virtual)
4-8 May 2020 2020 Euclid Consortium meeting (Barcelona, virtual)
4-7 June 2019 Annual Euclid Consortium meeting (Helsinki)
11-15 June 2018 Annual Euclid Consortium meeting (Bonn)
5-8 June 2017 Euclid Consortium Meeting, 100 years of Λ (London)
1 Dec 2016 Euclid Blue Grism workshop (IAP Paris)
20-23 Sep 2016 2016 Euclid Photometric Calibration workshop (ESAC)
30 May - June 2 2016 Annual Euclid Consortium meeting (Lisbon)
8-12 June 2015 Annual Euclid Consortium meeting 2015 (Lausanne)
10-11 Sep 2014 Euclid Science Team Meeting #9 (GSFC, Greenbelt MD)
8 May 2014 Euclid Science Team meeting #8 (Marseille)
5-9 May 2014 Annual Euclid Consortium Meeting 2014 (Marseille)
Mar 2014 NASA endorses funding for ENSCI, the US datacentre at IPAC
Nov 2013 Euclid Multi-Lateral Agreement was signed by the payload funding agencies.
Jul 2013 ESA selected Thales Alenia Space as the spacecraft prime contractor
13-15 May 2013 Annual Euclid Consortium Meeting (Leiden)
Jan 2013 NASA joined the mission
A Memorandum of Understanding between ESA and NASA was signed
Dec 2012 ESA selected Astrium Toulouse as the payload module prime contractor
15-16 May 2012 Euclid Mission Meeting (Copenhagen)
Oct 2011 Euclid selected for implementation


IN THE PICTURE 2018-01-24


Flight model of cryomotors allowing to select the NISP observing mode.

The Near Infrared Spectrometer and Photometer (NISP) is one of the two instruments on-board the Euclid spacecraft. After 3 years of R&D for the qualification model, and 6 months for building and testing the flight model, the two NISP cryomotors have successfully passed the relevant tests. CEA-Irfu is now ready to deliver them to the Euclid Consortium. More details here (in French).


In the spotlight: João Dinis

May 2018


João Dinis implements the reference survey
in the Euclid Sky Survey Working Group


Why did you join the Euclid team ?

In mid 2013 my PhD was coming to an end I began looking around for interesting
projects to work with.  In that process I was presented to the Euclid mission
and to the tasks assigned to IA (Instituto de Astrofísica e Ciências do
Espaço).  The main task is the computation of the reference survey.  That
interested me immediately as it is exactly the kind of algorithms I like to
develop, algorithms with a geometrical bent, and Ismael Tereno (of IA) was kind
enough to let me join the team.  Curiously, at that time, the task at hand
seemed much more simple than later revealed to be.  It took a few months to
learn the intricacies of the spacecraft and the mission and how they constrain
the survey computation.


What do you see as the biggest challenge in Euclid ?

The survey being computed will schedule pointing activity for the span of 6
years.  From my point of view, the biggest challenge will be having the
schedule run smoothly for the 6 years of the mission, in spite of all the
changes that may come ahead.  This means to accommodate changes in constraints
and goals which, at times, is very demanding.


What are your expectations with Euclid ?

Probably, most people have their minds set on what secrets the Euclid data will
unveil, when it comes to Dark Matter and Dark Energy.  But acquiring that data
and having it safely on ground will be a great achievement it itself.  It is
very rewarding and a source of pride to be part of team that will make that


If you had to define your work within Euclid with one word, what would it be ?

One word? Algorithms.  Building the tools to compute the reference survey
comprises the development and implementation of many algorithms, some tiny,
others quite involved, all working together for the same goal.  So far, this
has been very interesting and fun.