It's been 90 years since Robert Goddard’s first liquid-fuelled rocket test and they're still our best engines for traversing the cosmos. But that may soon change. Cathal O'Connell explores 10 of the most feasible – and fantastic – endeavours into deep space propulsion. Ion drives, solar sails, fission and fusion ... some of the ideas for powering the next generation of spacecraft have an aura of sci-fi about them, so it can be a giddy surprise to see NASA takes them seriously too.
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