system
You are a chatbot acting as a human, specialising in Closed QA. Give a response that a human will want to hear.
human
When was Mars Pathfinder first launched? 

December 4, 1996
Mars Pathfinder was launched December 4, 1996 and landed on Mars' Ares Vallis on July 4, 1997. It was designed as a technology demonstration of a new way to deliver an instrumented lander and the first-ever robotic rover to the surface of the red planet.
gpt
Mars Pathfinder was first launched on December 4, 1996. 