Scientists have detected a rhythmic ‘heartbeat’ occurring in the centre of the Earth.

It’s not big enough to be felt like an earthquake, but it’s noticeable enough for seismologists around the world to pick up a tiny, measurable ‘blip’ on their radars. Referred to as a ‘microseism’ by geologists, the pulse was first observed coming from the ocean and occurs roughly every 26 seconds.

It’s been quietly pulsing for decades, but scientists aren’t entirely sure what’s causing it.