ESA Observing the Earth

The countdown is on for scientists, researchers and Earth observation experts eager to help shape the future of the European Space Agency’s Earth Explorer satellite series. Registration is closing soon for the Earth Explorer 12 User Consultation Meeting.

This all-important event offers the opportunity to be part of the discussion on which of four pioneering candidate missions should advance to the next stage of development.

This radar image from the Copernicus Sentinel-1 mission captures Buenos Aires, the capital of Argentina, the surrounding countryside and the Rio de la Plata estuary.

Zoom in to explore this image at its full resolution.

This is a composite of three Sentinel-1 acquisitions taken in January, March and May this year, with each image assigned to a different colour channel (blue in January, green in March and red in May). As the environmental changes on the ground created a significant ‘backscatter’ reflection of the radar signal, they show up as bright shades that correspond to changes across the seasons.

On the right-hand side of the image, the metropolitan area of Buenos Aires is visible in light grey. The area has a population of more than 16 million people and lies at 25 m above sea level. The urban areas were largely unchanged between January and May, hence the lack of colour in this part of the image. Other towns, such as Luján and Junin, are also visible as smaller patches of grey west of the capital.

The blue areas correspond to surface changes such as choppy water, captured in January, which is mid-summer in Argentina. The rivers, deltas and open water are mainly coloured in either dark blue, purple or black. Winds and rough sea conditions during both January and May mean that the Rio de la Plata estuary, east of Buenos Aires, appears purple (a mix of blue in January and red in May). The Paraná river meanders through wetlands on the left of the image before flowing into the Rio de la Plata. The Uruguay river is also seen flowing from the north into the estuary.

To the west of Buenos Aires, agricultural fields and the Argentinean Pampas dominate the landscape. The green tint is due to significant ‘backscatter’ reflection of the radar signal in this area during the capture in March. Since this period is late summer in Argentina, it likely denotes growth of major crops such as soy and corn.

At the top of the image, a large area north of the Paraná river, in Entre Ríos province, appears in vivid red – the channel assigned to ground change in May, which is late Autumn in Argentina. It is likely that this is due to natural vegetation growth caused by seasonal rains during that period. This is when the areas of exposed grassland come back to life following the long, dry summers.

The World Settlement Footprint (WSF) Tracker, and its dedicated online platform, have been officially released at an event at the World Bank headquarters in Washington DC.

The European Space Agency has awarded the contract to lead the development and build for two Copernicus Sentinel-1 Next Generation satellites to Thales Alenia Space. Building on the success of the current Sentinel-1 mission, the next-generation satellites will ensure the long-term continuity of Europe’s radar Earth observation capabilities while delivering enhanced performance.

Press Release N° 20–2026

The European Space Agency (ESA) and the European Defence Agency (EDA) have signed an Implementing Arrangement to jointly identify strategic and technological gaps in Europe’s Earth observation capabilities and develop a long-term roadmap in support of security and defence.

Press Release N° 13–2026

Journalists are invited to a one-off opportunity to see three ESA-built satellites in their final preparations before liftoff. 

The Minoans were a sophisticated Bronze Age civilization (c. 3100–1100 BC) on Crete and widely regarded as Europe’s earliest advanced culture. They are best known for their impressive palace complexes, most notably Knossos, and for their far-reaching maritime trade, which most likely relied on celestial navigation and a detailed understanding of the constellations. The Minoans recognised a hidden order in the natural world: a force to be respected, yet also harnessed for human benefit. Their era, the Age of Bronze, marked a pivotal moment in the development of human society.

Today, our own relationship with nature must find a new equilibrium. The need to monitor environmental change has never been more urgent, and satellites provide the most powerful means of doing so. This video draws a line from the world of the Minoans to the satellites orbiting above us today, highlighting the vital role of metrology – the science of measurement – in ensuring that the data they provide are accurate and trustworthy. And it turns out that Crete is an ideal location for unique reference network that helps carry out this important task â€“ and particularly important for the Copernicus Sentinel-6 mission. 

The Sentinel-6 satellites carry the latest radar altimetry technology to further extend the sea-surface height record that began in the early 1990s. These measurements help scientists understand sea-level rise – crucial information for shaping climate policy and protecting the millions of people living in coastal areas around the world.

The first Sentinel-6 satellite was launched in November 2020, followed by Sentinel-6B in November 2025.

ESA’s first Scout mission, HydroGNSS, was launched on 28 November 2025, marking a significant step in advancing global understanding of water availability and the effects of climate change on Earth’s water cycle.

The two twin HydroGNSS satellites were carried into orbit aboard a SpaceX Falcon 9 rocket from the Vandenberg Space Force Base in California, US.

Embracing the New Space concept, HydroGNSS is one of ESA’s new Scout missions being developed within the Earth Observation FutureEO programme.

ESA’s first Scout mission, HydroGNSS, was launched on 28 November 2025, marking a significant step in advancing global understanding of water availability and the effects of climate change on Earth’s water cycle.

The two twin HydroGNSS satellites were carried into orbit aboard a SpaceX Falcon 9 rocket from the Vandenberg Space Force Base in California, US.

Embracing the New Space concept, HydroGNSS is one of ESA’s new Scout missions being developed within the Earth Observation FutureEO programme.