Saturn’s moon Mimas looks for all the world like the Death Star – the planet-destroying space station from the movie Star Wars – in this Cassini image taken in 2005. The giant crater at the centre of the image, called Herschel, was probably gouged out by an enormous asteroid impact. If the asteroid had been any bigger or had been moving much faster, it probably would have split the moon in two. (Image: NASA/JPL/Space Science Institute)
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