NASA’s Mars rover Curiosity stumbled upon a dark grey, golf-ball-size object last week that looks nothing like the typical red-orange rocks that are normally seen on Mars.

To figure out exactly what this weird rock is and where it came from, Curiosity used its on-board rock-zapping laser to analyze the rock’s chemical composition. This test revealed that it is an iron-nickel meteorite that fell from the Martian sky. Curiosity’s science team dubbed the newfound meteorite “Egg Rock.”

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