ESA Space Science

The European Space Agency (ESA) reacted promptly to the discovery of comet 3I/ATLAS on 1 July 2025. Soon after they were alerted to its existence by automated detection systems, ESA astronomers began using ground-based telescopes in Hawaii, Chile, and Australia to monitor its progress.

Since then, the comet has been observed by space telescopes close to Earth, including the NASA/ESA Hubble Space Telescope and the NASA/ESA/CSA James Webb Space Telescope.

In the coming months, ESA will turn interplanetary voyagers such as Mars Express, ExoMars Trace Gas Orbiter and the Jupiter Icy Moons Explorer (Juice) in the direction of the comet to make further observations from excellent vantage points.

Follow the links below for more information.

This shimmering view of interstellar gas and dust was captured by the European Space Agency’s Euclid space telescope. The nebula is part of a so-called dark cloud, named LDN 1641. It sits at about 1300 light-years from Earth, within a sprawling complex of dusty gas clouds where stars are being formed, in the constellation of Orion.

In visible light this region of the sky appears mostly dark, with few stars dotting what seems to be a primarily empty background. But, by imaging the cloud with the infrared eyes of its NISP instrument, Euclid reveals a multitude of stars shining through a tapestry of dust and gas.

This is because dust grains block visible light from stars behind them very efficiently but are much less effective at dimming near-infrared light.

The nebula is teeming with very young stars. Some of the objects embedded in the dusty surroundings spew out material – a sign of stars being formed. The outflows appear as magenta-coloured spots and coils when zooming into the image.

In the upper left, obstruction by dust diminishes and the view opens toward the more distant Universe with many galaxies lurking beyond the stars of our own galaxy.

Euclid observed this region of the sky in September 2023 to fine-tune its pointing ability. For the guiding tests, the operations team required a field of view where only a few stars would be detectable in visible light; this portion of LDN 1641 proved to be the most suitable area of the sky accessible to Euclid at the time.

The tests were successful and helped ensure that Euclid could point reliably and very precisely in the desired direction. This ability is key to delivering extremely sharp astronomical images of large patches of sky, at a fast pace. The data for this image, which is about 0.64 square degrees in size â€“ or more than three times the area of the full Moon on the sky â€“ were collected in just under five hours of observations.

Euclid is surveying the sky to create the most extensive 3D map of the extragalactic Universe ever made. Its main objective is to enable scientists to pin down the mysterious nature of dark matter and dark energy.

Yet the mission will also deliver a trove of observations of interesting regions in our galaxy, like this one, as well as countless detailed images of other galaxies, offering new avenues of investigation in many different fields of astronomy.

[Technical details: The colour image was created from NISP observations in the Y-, J- and H-bands, rendered blue, green and red, respectively. The size of the image is 11 232 x 12 576 pixels. The jagged boundary is due to the gaps in the array of NISP’s sixteen detectors, and the way the observations were taken with small spatial offsets and rotations to create the whole image. This is a common effect in astronomical wide-field images.]

[Image description: The focus of the image is a portion of LDN 1641, an interstellar nebula in the constellation of Orion. In this view, a deep-black background is sprinkled with a multitude of dots (stars) of different sizes and shades of bright white. Across the sea of stars, a web of fuzzy tendrils and ribbons in varying shades of orange and brown rises from the bottom of the image towards the top-right like thin coils of smoke.]

What began with tragedy ended in triumph. This is the untold story of the European Space Agency’s pioneering 25-year Cluster mission to study how invisible solar storms impact Earth's environment.

Like a ship in a never-ending storm, Earth is bombarded by swarms of particles ejected from the Sun at supersonic speeds. Most of these solar wind particles are deflected by the magnetosphere and sail harmlessly by, but Earth’s shield is not bulletproof.

Since 2000, Cluster sailed the seas of the Sun and revealed the complexities of the Sun–Earth connection. After two-and-a-half incredibly successful decades in space, ESA took the decision to safely deorbit the four Cluster satellites throughout 2024–2026. The mission officially ended on 8 September 2024.

But a space mission is so much more than science. Experience Cluster’s story as told by the people who lived it: scientists and engineers Arnoud Masson, C. Philippe Escoubet, Gill Watson, Gunther Lautenschläger, Lean-Nani Alconcel, Bruno Sousa, Paulo Ferri, Patrick W. Daly, Mandred Warhaut, Silvia Sanvido and Jolene S. Pickett.

The film was produced by Space Rocks for the European Space Agency. It features an original soundtrack by Karlotta Skagfield and additional music by Bruce Dickinson.

See the film poster

Listen to the podcast series about the film

More information about the film from Space Rocks

By fitting its sunshield and solar panels, engineers have completed the construction of Plato, the European Space Agency’s mission to discover Earth-like exoplanets. Plato is on track for the final key tests to confirm that it is fit for launch.

Between 1 and 7 October, ESA’s ExoMars Trace Gas Orbiter (TGO) and Mars Express spacecraft turned their eyes towards interstellar comet 3I/ATLAS, as it passed close to Mars. 

ESA’s Mars Express takes us on another mesmerising flight over curving channels carved by water, islands that have resisted erosion, and a maze of hilly terrain.

Central to the tour is a 1300 km-long outflow channel called Shalbatana Vallis. It cascades down from the highland region of Xanthe Terra to the smoother lowlands of Chryse Planitia.

Billions of years ago, water surged through this channel, creating many of the features we see today.

The tour culminates in a spectacular view of a 100 km-wide impact crater, smashed out of Mars’s surface when it collided with a space rock.

Enjoy the flight, and be sure to turn up the volume for the full audio guide experience.

Processing notes:

This film was created using the Mars Express High Resolution Stereo Camera Mars Chart (HMC30) data, an image mosaic made from single orbit observations of the mission’s High Resolution Stereo Camera (HRSC). The mosaic image, centred at 5°N/320°E, is combined with topography information from the digital terrain model to generate a three-dimensional landscape.

For every second of the movie, 50 separate frames are rendered following a predefined camera path in the scene. The vertical exaggeration used for the animation is three-fold. Atmospheric effects, like clouds and haze, have been added to conceal the limits of the terrain model. The haze starts building up at a distance of 250 km.

The HRSC camera on Mars Express is operated by the German Aerospace Center (DLR). The systematic processing of the camera data took place at the DLR Institute for Planetary Research in Berlin-Adlershof. The working group of Planetary Science and Remote Sensing at Freie Universität Berlin used the data to create the film.

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Scientists digging through data collected by the Cassini spacecraft have found new complex organic molecules spewing from Saturn’s moon Enceladus. This is a clear sign that complex chemical reactions are taking place within its underground ocean. Some of these reactions could be part of chains that lead to even more complex, potentially biologically relevant molecules.

Published today in Nature Astronomy, this discovery further strengthens the case for a dedicated European Space Agency (ESA) mission to orbit and land on Enceladus.

Our Milky Way galaxy never sits still: it rotates and wobbles. And now, data from the European Space Agency’s Gaia space telescope reveal that our galaxy also has a giant wave rippling outwards from its centre.

Scientists created the most accurate three-dimensional map of star-formation regions in our Milky Way galaxy, based on data from the European Space Agency’s Gaia space telescope. This map will teach us more about these obscure cloudy areas, and the hot young stars that shape them.

It is notoriously difficult to map and study regions in space where stars form because they are usually hidden from view by thick clouds of gas and dust, whose distances cannot be directly measured.

Gaia can’t see these clouds directly, but it can measure stellar positions and the so-called ‘extinction’ of stars. This means it can see how much light from stars is blocked by dust. From this, scientists can create 3D maps showing where the dust is, and use those maps to figure out how much ionised hydrogen gas is present – a telltale sign of star formation.

The new 3D map of star-forming regions in the Milky Way is based on Gaia observations of 44 million ‘ordinary’ stars and 87 O-type stars. The map extends to a distance of 4000 light-years from us, with the Sun at the centre.

Read more.

Click here to download the animation flying around Gaia's 3D map.

Click here to download the animation flying through Gaia's 3D map.

Click here to download the animation showing the location of Gaia's 3D map in the Milky Way.

Smile is a brand-new space mission currently in the making. It will study how Earth responds to the solar wind and solar storms.

At the European Space Agency’s technical heart in the Netherlands, engineers have spent the last four months carrying out ‘spacecraft environment testing’ – putting Smile through its paces to make sure it is ready for the shaky rocket launch, the vacuum of space and the extreme temperatures it will face in orbit around Earth.

Now all complete, Smile is one step closer to launch in 2026.

This video provides a glimpse into the testing process. It is the third episode in a series of short videos, and includes interviews with David Agnolon (ESA Smile Project Manager), Chris Runciman (ESA Smile System Engineer), Laura Malena Lottes (ESA Smile Mechanical Engineer), Benjamin Vanoutryve (ESA Smile AIT/AIV and Launcher Interface Principal Engineer), Li Jing (CAS Smile Project Manager), He Tau (CAS Smile Mechanical Engineer) and Zhu Xiaofei (CAS Smile Thermal Engineer). 

Smile (the Solar wind Magnetosphere Ionosphere Link Explorer) is a joint mission between the European Space Agency and the Chinese Academy of Sciences. Smile is due to launch on a European Vega-C rocket in 2026. Follow the latest mission news via esa.int/smile.

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Access the other episodes of ‘Let’s Smile’

Completing the spacecraft – Let’s Smile (episode 2)

Introducing the Smile mission – Let’s Smile (episode 1)

Smile’s other half arrives – Let’s Smile (action snippet)