\'Marsquake!\': NASA detects likely tremor on Mars

That rumbling is being called a 'Mars-quake.'

For the first time ever, scientists believe they've recorded likely tremors on a distant planet.

It was picked up five months after NASA's InSight touched down on the red planet, for its two year mission.

The robot spacecraft - seen here in this NASA animation - was designed specifically to study the deep interior of a distant world.

And scientists from the Jet Propulsion Lab in California believe the quake came from inside the planet.

While further tests are needed to prove that - it's the most concrete evidence yet, of seismic signals being recorded outside Earth.

The scientists believe it was roughly equal to a mere 2.5 magnitude quake back home.

Mars doesn't have tectonic plates - these tremors are caused by a cooling and contracting effect, that build enough energy to rupture the crust.

The InSight's main investigator said it officially launches a whole new field... called 'Martian Seismology.'