Answer: Entropy is basically a thermodynamic quantity that tells the randomness of a system or as said in the question tells us a measure of the disorder of the system. The second law of thermodynamics states that a closed system has entropy which may remain constant
I don't know what this question is asking but this statement is false because venus is a planet made of hot gas that cannot be landed on. So venus has not been explored by rovers. (However Mars has been explored by rovers)