A little while ago, the Mars Rover Curiosity, also known as the Mars Science Laboratory (MSL), successfully landed on Mars, in Gale Crater, an ancient crater named after astronomer Walter Frederick Gale, who observed the red planet in the nineteenth century. The Mars Rover Curiosity is the biggest and most sophisticated robots sent to Mars to date. It’s three times heavier than the Mars Rovers Spirit and Opportunity for a total of about 900 kg (about 2,000 pounds) and is equipped with instruments that are obviously more advanced.