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4 – The Mission to Bring Mars to Earth NASA and the European Space Agency are planning something historic. The Mars Sample Return mission. The goal? Bring Martian rock samples back to Earth for detailed laboratory testing. Inside advanced labs, scientists will search for microscopic fossils or undeniable biosignatures. If even a tiny fossilized microbe is found… It would be the greatest discovery in human history. Proof that life is not unique to Earth.