Cosmic distance ladder

The Cosmic Distance Ladder Terence Tao (UCLA)

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First Rung: The Radius of the Earth ,[object Object],[object Object]

The answer is yes - if one knows geometry! ,[object Object],[object Object]

Aristotle’s Argument ,[object Object],[object Object]

Eratosthenes’ Argument ,[object Object],[object Object],[object Object]

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Second rung: shape, size and location of the moon ,[object Object],[object Object],[object Object]

Again, these questions were answered with remarkable accuracy by the ancient Greeks. ,[object Object],[object Object],[object Object],[object Object]

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Third Rung: size and location of the sun: ,[object Object],[object Object]

How did this work? ,[object Object],[object Object],[object Object]

Fourth rung: distances from the Sun to the planets ,[object Object],[object Object],[object Object],[object Object]

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Fifth rung: the speed of light ,[object Object],[object Object],“ It’s the ship that made the Kessel run in less than twelve parsecs.”

Sixth rung: distance to nearby stars ,[object Object],[object Object],[object Object]

Seventh rung: distances to moderately distant stars ,[object Object],[object Object],[object Object]

Eighth rung: distances to very distant stars ,[object Object],[object Object],[object Object]

Ninth rung: the shape of the universe ,[object Object],[object Object]

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