The hunt for Planet 9

Beyond Neptune, a few small worlds are moving in harmony. Is a huge ninth planet pulling them around?

Eco-cities

With overpopulation and climate change taking their toll on our cities, engineers and urban planners are dreaming up some innovative ways to live.

Shock therapy

Does electroconvulsive therapy offer a life-saving treatment?

Plus

  • Richard Dawkins chats about faith, flat-Earthers and Facebook.
  • Should we stop having kids to save the planet?

Issue 340 on sale 4 September 2019

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The hunt for Planet 9: How we'll find the most mysterious object in the Solar System

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