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The greatest long-term threats facing humanity

How long can civilisation survive? To thrive for billions of years, there will be a few troublesome problems to solve – from the death of the Sun to the decay of matter.

Can we actually say anything about the far future?

  • Anders Sandberg
  • BBC

If we can’t predict when it will rain next month, forecasting billions of years hence might seem impossible.

However, not everything is as chaotic as the weather: even predictions very far ahead are sometimes possible, especially in astrophysics and cosmology.

We can be confident that there will be a total solar eclipse in the UK on 23 September 2090 because the…

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