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Are we alone?

Can ET hear the sounds of Earth?

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Artist's impression of the Cluster constellation
Artist's impression of the Cluster constellation.

ESA's mission Cluster consists of four identical spacecraft flying in formation between 19 000 and 119 000 km above the Earth. They study the interaction between the solar wind and Earth’s magnetosphere, or the Sun-Earth connection in 3D.

Credits: ESA
Earth's chirps and whistles, click on the top right to listen.
Credits: ESA
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