Marsquake

So, InSight has detected what appears to be a Marsquake.

Mars is much less active than Earth. The detected quake was somewhere between 1 and 2 on the Richter scale (for reference, people generally don't notice anything less than 2.5)

We aren't actually sure whether this is evidence Mars is still seismically active, as it could also have been caused by an unnoticed small meteor strike. We'll know more if InSight happens to feel more marsquakes. But this is the first time we've detected anything resembling seismic activity on Mars, so...