Every now and then, one of the robots on Mars sends back a picture of an unusual rock it has found on its journeys. After all ...

with the US space agency stating it is "unlike any" debris seen on Mars before. The object of this fascination is a black and white striped rock, dubbed 'Freya Castle' or "zebra rock".

Or, this "zebra rock", which is "unlike any [rock] seen on Mars before".

The images Perseverance captured late in September show a panorama of the Jezero Crater where the rover landed in February ...

striped rock the agency calls the "zebra rock" that is theorized to have rolled downhill. Because the rock was unlike anything yet encountered on Mars, the team had expressed hope that its ...

The presence of white rocks on Mars is particularly intriguing due to the planet's predominantly basaltic crust, which is typically dark in colour.

Welcome to Vermilion Cliffs National Monument, a 294,000-acre wonderland of geological marvels nestled in the heart of ...