By Dean Murray

The interior of Mars is filled with vast and mysterious rocks that smashed into the planet, new research shows.

Rocky material up to 2.5 miles (4 kilometers) across remains scattered in giant lumps below the Red Planet's surface.

The study by Imperial College London and NASA reveals what appear to be fragments from the aftermath of massive impacts on Mars that occurred 4.5 billion years ago.

The discovery was made thanks to NASA’s now-retired InSight lander , which detected the entities deep below the planet’s surface before the mission’s end in 2022.

NASA's Jet Propulsion Laboratory said: "The ancient impacts released enough energy to melt continent-size swaths of the early crust and mantle into vast magma oceans, simultaneously injecting the impactor fragme

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