The end of the year, and especially the end of a decade, prompts reflections on what's taken place over the last 12 or 120 months. But it's also an opportunity to look ahead and try to predict what will happen in the year or decade to come. Such predictions are fraught with uncertainty, though, especially in space. Ten years ago one might have foreseen SpaceX's Falcon 9 — which at the time had yet to launch — becoming one of the world's leading launch vehicles, although few people outside the company would have imagined that the company would have made the landing and reuse of the rocket's first stage routine by the end of the 2010s.
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