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Euclid scientists discover most distant known quasars
Quasars are growing super-massive black holes, they are the most powerful continuous energy sources in the Universe. Quasars are a key to understanding the formation of structure in the early Universe, and can also be used as very distant background light-sources to study the distribution of gas across space. Consortium scientists have now discovered 31 new quasars in the very early Universe using the first 18 months of Euclid data, more than doubling the known numbers, including the two most distant quasars known to date.
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Euclid Q1 special issue of Astronomy & Astrophysics
All results from the Euclid mission as well as a lot of reports, tests, and predictions are published as peer reviewed articles in scientific journals. The vast majority of almost 300 papers written by Euclid Consortium and ESA members so far were sent for publication in ‘Astronomy & Astrophysics’. Now an A&A ‘Special Issue’ collectively publishes 41 Euclid articles from last year’s data relase Q1.
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Behind the scenes: Euclid Galactic Bulge Survey (Q2)
On 23 March 2025, the Euclid space telescope targeted an unusual location: a region near the Galactic Centre, capturing an exceptionally deep, wide-field, and high-resolution view of the Milky Way’s inner bulge. Over roughly 24 hours, the telescope observed nine contiguous fields, covering a total of 4.8 square degrees, capturing the images of roughly 60 million stars in total. Now the images and catalogues are made public to the world – we take the opportunity to peek behind the curtain to see what makes this image so special and which challenges had to be overcome.
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Euclid starts seeing darkness
Euclid‘s core mission to study the nature of dark energy includes two central probes: one is tracking the expansion history of the Universe, the other traces structure formation over cosmic time. Ahead of the first cosmology results coming out in 2027, scientists have now published a first demonstration that Euclid can indeed trace massive structures dominated by usually invisible dark matter, using the technique of ‘weak gravitational lensing’.
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Space Warps – Euclid DR1
Space Warps is back! Do you want to join forces with Euclid Consortium scientists and discover gravitational lenses that no human has ever seen before? We’re announcing the next Space Warps Citizen Science campaign with Euclid data – now previewing images from Data Release 1. Here is how to become part of the project.
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Euclid and HST join forces to look at a Cat’s Eye
Euclid covers a much larger area in every image compared to previous space telescopes, all while resolving details. The Hubble Space Telescope has a roughly 2x larger mirror than Euclid and can still resolve structures twice as fine, but over a much smaller area: It could in principle carry out Euclid’s Wide Survey, but it would take 100s of years instead of only six. So what happens when combining Hubble’s eye for detail and Euclid’s field of view? Something incredible is the result.
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