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Tech Time Machine: 30 April

With cities polluting the night sky and drowning out our view of the stars, it's hard to imagine that a new star in the night sky would be a talking point.

Now playing: Watch this: Tech Time Machine: 30 April
1:25

With cities polluting the night sky and drowning out our view of the stars, it's hard to imagine that a new star in the night sky would be a talking point.

But that's exactly what happened way back in 1006AD when the brightest supernova seen by mankind burst into view. Just how bright? Watch today's Tech Time Machine to find out about it, and also see General Motors' dazzling Futurama show car exhibits.