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Japan sets sail for Venus with solar-powered space yacht

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The Japanese space agency, flushed with the success of its origami space orbiter and zero-gravity sushi experiments, is poised for another spectacular leap into the cosmos: the launch of the first “space yacht”.

In three weeks’ time, in a trial run that is expected to captivate space researchers and science-fiction writers alike, a Mitsubishi H-IIA rocket will be sent into orbit from the island of Tanegashima and release its small satellite into the void.

Soon afterwards, having spent a few weeks first settling into a slow rotation, Ikaros will reveal its secret, unfurling the microscopically fine 20m sail that some believe to be the future of interplanetary travel.

Over the following six months — and if the theory of “solar yacht” propulsion holds up — Ikaros will begin its silent journey towards Venus, driven by only the tiny but relentless force of solar particles buffeting the sail.

If it works, it will be a triumph. Other space agencies have succeeded in unfurling experimental sails in space, but have yet to produce the expected propulsion. With every passing second Ikaros should gather a tiny amount of speed.

The craft derives its name from Icarus, the character from Greek mythology whose ill-planned flight took him too close to the Sun and ended in disaster.

Keen to avoid this association, the Japan Aerospace Exploration Agency (Jaxa) is keen to point out that Ikaros stands for Interplanetary Kite-craft Accelerated by Radiation of the Sun. A larger version of the vessel could eventually travel at tens of thousands of miles per hour without any fuel.
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