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...is the point of no return? German physicist, Karl Schwarzchild calculated the event horizon of black holes. And it can tell us more about the eventual fate of all the galaxies...Find out more about The Open University's Natural Sciences courses. Transcript Read Stephen Serjeant on the speed of light Discover how you can study physics and astronomy with The Open University...

...how Einstein was right all along about the expanding Universe. We never should have doubted him...Find out more about The Open University's Natural Sciences courses. Transcript Read Stephen Serjeant on what it means to equate the curvature of the Universe with the amount of stuff in the Universe Discover how you can study physics and astronomy with The Open University...

...language barrier is often limiting the social interactions individuals can have. So culture and social structure are intertwined in some ways: you are more likely to pick up the habits of individuals with whom you interact; and the more you pick up these habits, the harder it becomes to interact with others outside your group. One big ocean – so why the different clans?...