After more than a year, a father-daughter team has deciphered a coded 'alien signal' sent from Mars to Earth, revealing depictions of amino acids.

The 'alien signal' was beamed at Earth by the European Space Agency's (ESA) ExoMars Trace Gas Orbiter Mars probe as part of an art project called 'A Sign in Space,' which aimed to test the process of deciphering potential alien signals.

After over a year of deciphering, father and daughter team Ken and Keli Chaffin have decoded the message, which involved extracting it from raw radio data with the help of over 5,000 citizen scientists.

The ESA explained that the team realized the signal 'contained movement,' leading them to speculate that the signal could contain information about the cellular nature of life. The message contained images of five amino acids, and now the challenge begins as to what the images mean.

The goal of the artistic experiment was to rehearse the event of an alien signal being detected on Earth.