PREVIEW
... Tang Yue nearly answered at the same time.
In the early Mars exploration missions, the engineers used a rather simple and crude solution to deal with the final stage of landing—the last tens of meters—by using airbags.
By wrapping the probe in an airbag, they allowed it to crash straight into the Martian surface and decrease its altitude and energy by repeated bounces. In essence, it was no different from the safety airbags in a car. It was ancient and simple, ...
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