These are three famous Mars rovers. The smallest is NASA's Sojourner rover which was launched back in 1997 and became the first successful Mars rover after Mars 2 and 3 failed. The second largest is the famous Opportunity/Spirit rover which landed in 2004. NASA lost the contact to Spirit in 2010 after about 6 years of operation. Opportunity was fully functional until June 2018 which is pretty remarkable. The largest is NASA's latest Curiosity Mars rover. It has about the same size as a medium sized car and landed on Mars in 2012. The rover is active till today and drives around in the Gale Crater.
Photo from: NASA
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