Re: Sonic boom, Light Boom?

Henry Spencer wrote:

> > The density of the ISM is on the rough order of an atom per cubic centimeter.
>
>
> No, that's an old number.  The "Local Cloud" in which we sit is about
> 0.07 atom/cc, and the "Local Bubble" outside that (several hundred LY 
> across) is down around 0.005 atom/cc.

That's why I said 'rough order'.

	Paul