New NASA-funded research suggests that Mercury is contracting even today, joining Earth as a tectonically active planet. Images obtained by NASA’s MESSENGER spacecraft reveal previously undetected small fault scarps— cliff-like landforms that resemble stair steps.
![Tectonically Active Planet Mercury press_photo_4](https://b47994.smushcdn.com/47994/files/2016/09/press_photo_4-220x220.jpg?lossy=1&strip=1&webp=1)
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