Solar sail
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Nasa unfurls giant solar sail – and you can see it from Earth
Centuries after it was first theorised, the sunlight propulsion method could herald a new era of space exploration Nasa has unfurled a solar sail in space for the first time, aiming to harness the propulsive power of sunlight for interstellar travel. The US space agency revealed that it had deployed the solar sail 1,000 kilometres (600…