Millions of years ago, an epic journey began from Mars. A giant asteroid slammed into the surface, gouging out chunks of the Martian crust and hurling them into space.
slammed into the surface, gouging out chunks of the Martian crust and hurling them into space.
The team has named that impact crater Karratha, after a region in Australia where some of Earth's oldest rocks can be found. This new geological context for the rock – a volcanic mineral, composed of different kinds of rock in what's known as a breccia – will aid comparisons of the formation history of Earth and Mars.
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