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There could be aliens living underground on Mars, a groundbreaking study has found.

Experts say radioactive elements which keep bacteria alive in water-filled cracks on Earth – in a process known as radiolysis – could be doing the same on the far-away planet in space.

The bombshell findings, published in Astrobiology, claim that below the Martian surface, microbial life could have been thriving for billions of years.

Scientists also studied the potential richness of life on the planets underground through looking at chunks of rock.

They found a whopping one million microbes could exist in just one kilogram of rock – similar to samples right here on earth, reports Space.

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