How do radar satellites work?

Radar allows us to see through what would otherwise be invisible. By sending out radio waves that bounce off objects and return as echoes, radar creates a detailed picture of our surrounding world.

This technology is everywhere: from guiding air traffic and enabling self-driving cars to tracking the movements of athletes. But its reach doesn’t stop there—radar is also transforming how we observe our Earth from space.

Satellites like the Copernicus Sentinel-1 mission use radar to see through clouds, darkness and any weather conditions. This capability is invaluable for detecting subtle changes on Earth’s surface—changes that are often hidden from the human eye. Discover how radar technology is helping us unlock these hidden insights about our planet.

Credit: ESA – European Space Agency

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