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How could we build an invisibility cloak to hide Earth from an alien civilization?

It’s only fair to share…How could we build an invisibility cloak to hide Earth from an alien civilization? David Kipping, Columbia University What would it take to hide an entire planet? It sounds more like a question posed in an episode of “Star Trek” than in academic discourse, but sometimes the bleeding edge of science… Read more »

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NASA: streaks of salt on Mars mean flowing water, and raise new hopes of finding life

It’s only fair to share…NASA: streaks of salt on Mars mean flowing water, and raise new hopes of finding life David Rothery, The Open University Salty streaks have been discovered on Mars, which could be a sign that salt water seeps to the surface in the summers. Scientists have previously observed dark streaks (see image… Read more »