It’s been 25 years since the first NASA rover landed on Mars

This month saw a very special Martian anniversary, as NASA celebrated 25 years since the Pathfinder mission touched down on Mars. This mission included the first ever rover which explored Mars, called Sojourner, and opened the door to modern Mars exploration. Launched in December 1996, the Pathfinder spacecraft landed a base station along with a rover on July 4 1997 in the Ares Vallis region of Mars.

The mission collected some of the earliest data on the Martian atmosphere and climate as seen from the surface and looked at the composition of rocks and soil in the region as well.

The newly deployed Sojourner rover - the first of its kind on the red planet - sits on the Martian surface after driving down Pathfinder's ramp in July, 1997..This eight-image mosaic was acquired by Pathfinder July 5, 1997, the second Martian day, or sol, of the mission. The newly deployed Sojourner rover – the first of its kind on the Red Planet – sits on the Martian surface after driving down Pathfinder’s ramp. NASA/JPL-Caltech

The rover, named after activist Sojourner Truth, was tiny compared to the car-sized rovers which explore Mars today. At just 25 pounds it was, as NASA describes, “no larger than a microwave oven.” But it demonstrated the feasibility of rovers as a way to explore other planets.

The rover’s explorations also inspired a generation of Mars scientists and engineers. “That moment – seeing this little mechanical rover exploring the surface of another planet – made me realize that’s something I would love to do,” said Jessica Samuels, the mission manager for the current Mars rover Perseverance, who was an engineering intern when Pathfinder landed. “I had always been interested in space, but that was the spark where I thought this could actually be my profession.” The mission was also notable for making early use of the internet, with NASA setting up a website dedicated to the mission which became popular with early web users. It also demonstrated the public engagement value of sharing data from space missions, which continues today with programs like the public archives sharing all of the raw images taken by cameras on the Perseverance rover and Curiosity rover.

“Putting so much online so quickly was a paradigm shift,” said Doug Ellison, who works on the Curiosity rover mission. “That’s the motivation today to share as much as we can as quickly as we can from our rover missions.

I think the Mars program owes Pathfinder a debt of gratitude for being the entire stepping stone for everything since.”

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