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It is the picture that confirms Japan's Ikaros solar sail is fully extended and ready for the next part of its mission. ... The project team will be particularly concerned to keep the sail fully extended and flat. Rather than employ rigid booms or ribs to do this, Ikaros simply spins, making one or two revolutions per minute.


 sail solar light photon space travel Ikaros
Researchers have devised a penny-sized silicon chip that uses photons to run Shor's algorithm - a well-known quantum approach - to solve a maths problem.


 quantum computer quantum physics optical photon physics computer
Physicists have confirmed the ultimate speed limit for the packets of light called photons - making time travel even less likely than thought.


 time travel time physics photon light causality