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The night of 26 September 2022 will make space history - as the moment when NASA's DART spacecraft impacts the Dimorphos asteroid in an attempt to divert its course - humankind's first planetary defence test. Next, in 2024, ESA launches its Hera spacecraft to investigate the post-impact asteroid. In fact, Hera is not one spacecraft but three: it carries with it ESA's first deep-space CubeSats to make extra observations of its target.