As Perseverance, Hope, Tianwen-1 close in on Mars, here are the missions that paved their way

Perseverance will be the fifth rover to arrive at Mars that's capable of venturing across the surface of another planet.

from http://www.firstpost.com/tech/science/as-perseverance-hope-tianwen-1-close-in-on-mars-here-are-the-missions-that-paved-their-way-9292371.html