See the stunning first images taken by the dark matter-hunting Euclid telescope

November 8, 2023
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The European Space Agency (ESA) has released the first full-color images taken by Euclid, a space telescope that was launched earlier this year to probe the mysteries of dark matter and dark energy. Euclid will image a huge area of the sky to build up a 3D map of the universe, helping researchers to track the dark matter that is clustered around galaxies and the dark energy that counteracts gravity to push galaxies apart.

The Horsehead Nebula, also known as Barnard 33, is part of the Orion constellation. About 1,375 light-years away, it is the closest giant star-forming region to Earth. With Euclid, which captured this image, scientists hope to find many dim and previously unseen Jupiter-mass planets in their celestial infancy, as well as baby stars.
The Horsehead Nebula, also known as Barnard 33, is part of the Orion constellation. About 1,375 light-years away, it is the closest giant star-forming region to Earth. With Euclid, which captured this image, scientists hope to find many dim and previously unseen Jupiter-mass planets in their celestial infancy, as well as baby stars. ESA/Euclid/Euclid Consortium/NASA, image processing by J.-C. Cuillandre (CEA Paris-Saclay), G. Anselmi; CC BY-SA 3.0 IGO

Euclid is designed with a wide field of view, meaning it is unlike telescopes like the James Webb Space Telescope which is designed to look in very high resolution at specific targets. Instead, Euclid looks over a large area to capture views that will cover one-third of the sky and contain billions of galaxies. Even so, Euclid is still powerful enough to see some targets in stunning detail, like this image of the famous Horsehead Nebula which is located 1,375 light-years away.

Primarily, though, Euclid will be used to look at galaxies on a larger scale, such as an image that shows the Perseus cluster. This cluster contains thousands of galaxies, with hundreds of thousands more galaxies visible in the background.

One of the first images captured by Euclid shows the Perseus cluster, a group of thousands of galaxies located 240 million light-years from Earth. The closest galaxies appear as swirling structures while hundreds of thousands of background galaxies are visible only as points of light.
One of the first images captured by Euclid shows the Perseus cluster, a group of thousands of galaxies located 240 million light-years from Earth. The closest galaxies appear as swirling structures while hundreds of thousands of background galaxies are visible only as points of light. ESA/Euclid/Euclid Consortium/NASA, image processing by J.-C. Cuillandre (CEA Paris-Saclay), G. Anselmi; CC BY-SA 3.0 IGO

“We have never seen astronomical images like this before, containing so much detail. They are even more beautiful and sharp than we could have hoped for, showing us many previously unseen features in well-known areas of the nearby Universe. Now we are ready to observe billions of galaxies, and study their evolution over cosmic time,” said René Laureijs, ESA Euclid Project Scientist, in a statement.

The spiral galaxy IC 342, located about 11 million light-years from Earth, lies behind the crowded plane of the Milky Way: Dust, gas, and stars obscure it from our view. Euclid used its near-infrared instrument to peer through the dust and study it.
The spiral galaxy IC 342, located about 11 million light-years from Earth, lies behind the crowded plane of the Milky Way: Dust, gas, and stars obscure it from our view. Euclid used its near-infrared instrument to peer through the dust and study it. ESA/Euclid/Euclid Consortium/NASA, image processing by J.-C. Cuillandre (CEA Paris-Saclay), G. Anselmi; CC BY-SA 3.0 IGO

Euclid’s preliminary test images were released in August this year, but soon after the telescope developed an issue with its guidance system. The instrument which was designed to lock onto stars was intermittently failing, causing errors. Fortunately, that issue was fixed with a software update in October, and the telescope is now able to capture these beautiful images of various targets.

The galaxy NGC 6822 is located 1.6 million light-years from Earth. Euclid was able to capture this view of the entire galaxy and its surroundings in high resolution in about one hour, which isn’t possible with ground-based telescopes or targeted telescopes (such as NASA’s Webb) that have narrower fields of view.
The galaxy NGC 6822 is located 1.6 million light-years from Earth. Euclid was able to capture this view of the entire galaxy and its surroundings in high resolution in about one hour, which isn’t possible with ground-based telescopes or targeted telescopes (such as NASA’s Webb) that have narrower fields of view. ESA/Euclid/Euclid Consortium/NASA, image processing by J.-C. Cuillandre (CEA Paris-Saclay), G. Anselmi; CC BY-SA 3.0 IGO

“Euclid’s first images mark the beginning of a new era of studying dark matter and dark energy,” said Mike Seiffert, Euclid project scientist at NASA’s Jet Propulsion Laboratory. “This is the first space telescope dedicated to dark universe studies, and the sheer scale of the data we’re going to get out of this will be unlike anything we’ve had before. These are big mysteries, so it’s exciting for the international cosmology community to see this day finally arrive.”

This sparkly image shows Euclid’s view of a globular cluster – a collection of gravitationally bound stars that don’t quite form a galaxy – called NGC 6397. No other telescope can capture an entire globular cluster in a single observation and distinguish so many stars within it.
This sparkly image shows Euclid’s view of a globular cluster – a collection of gravitationally bound stars that don’t quite form a galaxy – called NGC 6397. No other telescope can capture an entire globular cluster in a single observation and distinguish so many stars within it. ESA/Euclid/Euclid Consortium/NASA, image processing by J.-C. Cuillandre (CEA Paris-Saclay), G. Anselmi; CC BY-SA 3.0 IGO

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