![](http://www.ecns.cn/hd/2019/11/25/eb0a2d7ffc8f42c5b9be1003049a9d17.jpg)
The robotic arm on NASA's InSight Mars lander is pinning a heat flow probe, or mole, to one side of a hole it's created in the surface, increasing friction enough for the mole to burrow deeper. (Photo/IC)
![](http://www.ecns.cn/hd/2019/11/25/db8f96d583d84d28ad971da8e66676e0.jpg)
The robotic arm on NASA's InSight Mars lander is pinning a heat flow probe, or mole, to one side of a hole it's created in the surface, increasing friction enough for the mole to burrow deeper. (Photo/IC)
![](http://www.ecns.cn/hd/2019/11/25/016237b70eb94c55ac454ff554c42f74.jpg)
The robotic arm on NASA's InSight Mars lander is pinning a heat flow probe, or mole, to one side of a hole it's created in the surface, increasing friction enough for the mole to burrow deeper. (Photo/IC)