Cosmology and the Origin of Life

- Gravitational Force is an attractive force which weakens with
the inverse square of the distance between two mass points. Thus,
double the distance and the gravitational force weakens by a
factor of 4

But Newton makes Two Mistakes:

- He assumes space is flat
- He assumes communication time is instantaneous

- Sets the speed of light to be independent of the motion of
the source --> provides absolute frame and finite communication
time. If not, you could have this .
- Thus, Einstein gives us causality - a very important thing
- Suggests that mass causes curvature of space and which is what
we call gravity. This means that time can act strangely in a strong
gravitational field:
- An Orbit in Curved Space --> This is a prediction made by General Relativity and confirmed by direct observation of Mercury.
- The Ant Universe in Flat Space
- The Ant Universe in Curved Space

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