The ZX-calculus is incomplete for quantum mechanics

We prove that the ZX-calculus is incomplete for quantum mechanics. We suggest the addition of a new 'color-swap' rule, of which currently no analytical formulation is known and which we suspect may be necessary, but not sufficient to make the ZX-calculus complete.Comment: In Proceedings QPL 2014, arXiv:1412.810

Massive clouds erupted 260km into Martian atmosphere – and no one knows why

First paragraph: Enormous cloud-like plumes reaching 260km above the surface of Mars have left scientists baffled. This is way beyond Mars’s normal weather, reaching into the exosphere where the atmosphere merges with interplanetary space. None of the conventional explanations for such clouds make sense – neither water or carbon dioxide ice nor dust storms nor auroral light emissions usually hit such heights. Access this article on The Conversation website: https://theconversation.com/massive-clouds-erupted-260km-into-martian-atmosphere-and-no-one-knows-why-3765

Metal asteroid Psyche is all set for an early visit from NASA

First paragraph: Three times further away from the sun than the Earth lies an enormous lump of metal. Around 252km in diameter, the metallic “M-class” asteroid 16 Psyche is the target of NASA’s next mission to the belt of giant rocks that encircles the inner solar system. And the space agency now plans to visit itmuch soonerthan originally planned

Small glitches, but Rosetta comet mission is achieving major scientific goals

First paragraph: The landing of Rosetta’s Philae on comet 67P/Churyumov–Gerasimenko was a triumph of engineering. Many spectacular scientific firsts will follow now, but small glitches during the landing make it more difficult to obtain all of the scientific goals. Access this article on The Conversation website: https://theconversation.com/small-glitches-but-rosetta-comet-mission-is-achieving-major-scientific-goals-3422

Orion launch: why we need more than one mission to Mars

First paragraph: After a 24-hour delay due to bad weather, the first test launch of the Orion spacecraft by NASA is underway with the ultimate goal of putting human beings on Mars. Access this article on The Conversation website: https://theconversation.com/orion-launch-why-we-need-more-than-one-mission-to-mars-3505

How feasible are Elon Musk’s plans to settle on Mars? A planetary scientist explains

Mars is the future. It’s after all NASA’s current overarching goal to send humans to the Red Planet. But even as early as the 1950s, aerospace engineer Wernher von Braun, had published his vision of a mission to Mars in his book The Mars Project. We’ve also heard visions of settling the Red Planet under the leadership of a private organisation before. So why does Elon Musk get so much attention? And how feasible are his ideas? Access this article on The Conversation website: https://theconversation.com/how-feasible-are-elon-musks-plans-to-settle-on-mars-a- planetary-scientist-explains-6634

The seven most extreme planets ever discovered

First paragraph: Scientists recently discovered the hottest planet ever found – with a surface temperature greater than some stars. As the hunt for planets outside our own solar system continues, we have discovered many other worlds with extreme features. And the ongoing exploration of our own solar system has revealed some pretty weird contenders, too. Here are seven of the most extreme