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The Curiosity rover

The Mars Science Laboratory rover Curiosity is 3 meters long, 2.7 meters wide and 2.2 meters tall. It weighs 899 kilograms.
Below is a size comparison between three NASA Mars rovers. The smaller one in the front is the flight spare for the Mars Pathfinder rover Sojourner, which landed on Mars in 1997 as part of the Mars Pathfinder mission. On the left is a Mars Exploration Rovers test rover, a working sibling to Spirit and Opportunity, which landed on Mars in 2004. On the right is a test rover for the Mars Science Laboratory rover Curiosity, which touched down in 2012.
The two spacecraft engineers are Matt Robinson of NASA’s Jet Propulsion Laboratory on the left, and beside him Wesley Kuykendall of the California Institute of Technology.

Three NASA Mars rovers. Right: Curiosity. Left: Spirit/Opportunity. In front: Sojourner from the Pathfinder mission. Click image for higher resolution or click here for highest resolution. Image credit: NASA/JPL-Caltech.