NASA’s InSight probe on Mars has detected and measured its first seismological tremor.
The InSight spacecraft was designed to study the deep interior of the planet in a two-year investigation.
Scientists are still examining the data to determine the cause but the trembling does not appear to be caused by forces above the surface, such as wind, but has originated from inside the planet.
Seismic Experiment for Interior Structure principal investigator, Philippe Lognonne, said, it was "exciting to finally have proof that Mars is still seismically active".