Consortium

Yannick Mellier, 1958–2025

Consortium, People / By

Au revoir Yannick! It is with greatest sadness that we have to announce the passing of Yannick Mellier, lead of the Euclid Consortium since 2011. Yannick has worked tirelessly to steer Euclid’s development from before its adoption as a mission by ESA to the first science results in 2025. Much of what the Consortium is today bears his mark – and the first flagship paper introducing the first Euclid science results is, and will be, a ‘Euclid Collaboration: Mellier et al.’

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Yannick Mellier, 1958–2025Read More »

Yannick Mellier, 1958–2025 Read More »

Clouds, darkness, dust, … and light

Consortium, Science, Telescope and instruments / By

Just recently, in early November 2025, ESA released Euclid’s image of ‘LDN 1641’, an actively star-forming region in the ‘sword’ region of the constellation Orion. This region was observed by Euclid in near-infrared wavelengths early on in the mission, during a test for the spacecraft’s ability to orient itself in the sky: will the spacecraft get confused if it has very little information for orientation? We now added a ground-based image in visible light and created a comparison – a tale of young stars and clouds of dust, and the struggle for light trying to shine through strong absorption.

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Clouds, darkness, dust, … and lightRead More »

Clouds, darkness, dust, … and light Read More »

Here Comes the Sun…

Consortium, Telescope and instruments / By

Were you lucky enough to see the aurora earlier this week? Stronger than usual solar activity recently gave many people across the world a chance to see this spectacular light show – the result of eruptions of particles from the Sun travelling towards Earth and interacting with our planet’s atmosphere. But how was Euclid affected by this space weather…?

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Here Comes the Sun…Read More »

Here Comes the Sun… Read More »

Euclid’s view of the ‘Morphological Tuning Fork’ of galaxy classifications

Consortium, ESA, Publication, Science / By

Text by Louis Quilley, Francine Marleau, Knud Jahnke

In March 2025 ESA and the Euclid Consortium released the first 63 square degrees of calibrated Euclid science images and catalogues, the Q1 release. At the same time, a set of descriptive technical articles and first scientific papers were released to the public. A second set of publications is now ready and has just been released – the EC issued a press release on this.

We have been using this occasion to dip into the more than 20 million galaxies observed for the Q1 release to re-construct a very classical display of extragalactic astronomy: the so-called ‘Morphological Tuning Fork’ – as seen by Euclid.

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Euclid’s view of the ‘Morphological Tuning Fork’ of galaxy classificationsRead More »

Euclid’s view of the ‘Morphological Tuning Fork’ of galaxy classifications Read More »

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