What's Holding Smart Cities Back?
A tech-empowered urban renaissance is possible—if five challenges can be overcome-- Read more on ScientificAmerican.com
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Amid departures, Planetary Resources is holding out hope for an asteroid mining comeback
An artist’s conception shows the Arkyd-301 spacecraft, which was destined to start blazing a trail for asteroid prospecting in 2020. (Planetary Resources Illustration)
It’s been months since had to scale back its asteroid aspirations because — and th...