The Mars rovers—Spirit, Opportunity, Curiosity, and Perseverance—have greatly helped us learn about the Red Planet. Each rover has its own special purpose and qualities.

Spirit and Opportunity (MER Mission)

• Launch: 2003
• Main Goal: Look for signs of water from the past.
• Key Features: These twin rovers are similar in design and both have scientific tools. Spirit worked until 2010, while Opportunity lasted nearly 15 years, continuing its mission until 2018.
• Important Discoveries: Both rovers discovered signs of ancient water in Martian rocks. This information is crucial for understanding the history of Mars's climate.

Curiosity (MSL Mission)

• Launch: 2011
• Main Goal: Check if Mars could support life and look for organic materials.
• Key Features: Curiosity is much bigger than the earlier rovers. It has advanced tools and even a drill to collect rock and soil samples.
• Important Discoveries: Curiosity studied the Gale Crater and found evidence of old riverbeds. This suggests that conditions on Mars might have allowed for tiny life forms in the past.

Perseverance (Mars 2020 Mission)

• Launch: 2020
• Main Goal: Search for signs of ancient life and gather samples to send back to Earth later.
• Key Features: Perseverance has a helicopter called Ingenuity that made the first powered flight on another planet.
• Important Discoveries: The rover landed in Jezero Crater, where it has been gathering samples and doing experiments that could help with future human missions to Mars.

In short, all these rovers aim to uncover the secrets of Mars. However, each one focuses on different parts of the planet's story and its ability to support life!