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Skip to 0 minutes and 32 secondsWelcome to the second week. Before starting, let us recall what we have learned so far. We have seen the theory of gravity developing over centuries, starting with Galileo, who identified the universality of free fall. Then we have Isaac Newton, who gave us the law of gravity, law that applies to any material body, whether on earth or in the sky. And finally, the theory of Einstein included both space and time in its description and introduced the concept of space-time. Now we have seen that in that theory, light rays, for example, are bent by a concentration of mass. And this is interpreted as an effect due to the curvature of precisely this space-time.

Skip to 1 minute and 30 secondsIt is now time to address the theory of general relativity and to apply its equation not to any object, like a star, like a planet, but to the whole universe.

Where do we stand?

A short recap of the theory of gravity as we have seen it developing over centuries from Galileo to Newton and Einstein, in the first week of this course (1:51 minutes).

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This video is from the free online course:

Gravity! From the Big Bang to Black Holes

Paris Diderot

Course highlights Get a taste of this course before you join:

  • Galileo and the falling bodies
    Galileo and the falling bodies

    Watch Pierre Binétruy explain how Galileo found the law of free, using a combination of real (inclined plane) and thought experiments (12 minutes)

  • First encounter with relativity
    First encounter with relativity

    Pierre Binétruy focuses on the notion of inertia, measured by mass, frame of reference and Galileo's principle of relativity