"Close, but no cigar this time," tweeted SpaceX CEO Elon Musk after his latest rocket launch ended with a bang. On 10 January the firm successfully sent an uncrewed Dragon capsule on its way to the International Space Station - its fifth such mission. However, plans to land the first stage of the Falcon 9 rocket on a boat ended in failure. Most rockets are single use, falling into the sea once their fuel is spent and this increases the cost of space flight. So SpaceX was keen to try and land the first stage of its Falcon 9 rocket, with an eye to reusing it.
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