16-11-2017 11:00 AM CET
![](https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2017/11/sirenum_fossae_perspective_view/17250200-1-eng-GB/Sirenum_Fossae_perspective_view_small.jpg)
These striking features on Mars were caused by the planet's crust stretching apart in response to ancient volcanic activity.
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