- #1

NeedPhysHelp8

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Hoping you can help with this problem!

## Homework Statement

For a flat universe, show that [tex] t_{0}=2/3 (H_{0})^{-1} [/tex] ? Seems like a simple problem I just don't really know where to start.

## Homework Equations

Hubble's law [tex] v= H_{0}r [/tex]

and then [tex] t= 1/H_{0} [/tex]

## The Attempt at a Solution

I just need guidance where to start. Flat universe means that expansion is constant in any direction right? What do I do?