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It's a patchy, pale river in the sky - and a twirling spiral of 400 billion stars. It’s also headed for a dazzling intergalactic train wreck. Welcome to our Milky Way.
Alan and Amanda debate the number of civilisations that might be out there, get the maths wrong, and argue about whether our biggest barriers to coexistence would be linguistic or… dietary.
The science of exoplanets is stupendously fast-moving. The more we look for alien worlds, the more of them we find. Thousands and thousands of them, all with terrible names.
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