Did you know our solar system is cruising through a giant bubble of superheated plasma, carved out by at least 15 nearby supernova explosions? In this video, we’re investigating the ancient expanding structure of the Local Hot Bubble, while racing towards its very centre.
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The Gautrain rail project was one of the biggest construction jobs in the southern hemisphere in recent years – a hugely ambitious scheme that has put South Africa among leading nations with a state of the art high-speed rail transport system. The sheer scale of this massive engineering feat, completed in the midst of the daily bustle of two of South Africa’s largest cities, has been hard to imagine. It involved burrowing through some of the hardest rock in the world, firming up risky sink-hole terrain and building of massive superstructures that have changed the face of Johannesburg and Pretoria. But questions remain whether the Gautrain will solve the transport problems of South Africa’s economic heartland….. where the car is still king!
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