The Mars Rover Curiosity has achieved a long-awaited milestone by drilling a hole into the rocky surface of Mars, something that had never been done before, and is now collecting samples for analysis. NASA calls the drilling the most challenging engineering task the rover has faced since landing last summer. This first drill was so complex that several steps had to be completed before it could be undertaken. It is expected to take several days before Curiosity transfers the powder to its instruments to analyze the chemical and mineral makeup. (Image Credit: NASA)
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