<ul><li>European Space Agency (ESA) sends a 'mock' signal from Mars using the ExoMars Trace Gas Orbiter as part of the 'A Sign in Space' project.</li><li>The encoded message was flashed on May 24 and aims to prepare a response in the event of a signal from an extraterrestrial civilization.</li><li>The public and experts worldwide are invited to decode and interpret the message, with contributions to be shared on the project's website and social media.</li><li>The ESA spacecraft has been orbiting Mars since 2016, searching for evidence of biological or geological activity on the Red Planet.</li></ul>

Alien mock signal sent to Earth from Mars for the first time

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