Why are the Soviet *Venera* probes, which landed on Venus, not counted as rovers?

Answer

They were stationary observatories and could not traverse the terrain.

The Venera probes were successful in landing on Venus but were stationary observatories. They could not move across the surface to examine different geological formations, meaning they lacked traversal capability.

Why are the Soviet *Venera* probes, which landed on Venus, not counted as rovers?

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