The plan was routine. The rover was supposed to drill into the rock, collect a sample, and simply pull back. But it didn't turn out to be that simple. Nasa's Curiosity rover has been exploring Mars for nearly 14 years, drilling into rocks, analysing soil, and sending back thousands of images from the Red Planet's surface. In all that time, engineers had seen rocks crack and layers flake off during ... [2499 chars]
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