On a sunny day (Tue, 25 Sep 2012 00:00:27 -0400) it happened Yousuf Khan
wrote in :

Astronomers Discover Milky Way’s Hot Halo
http://www.universetoday.com/97535/a...ways-hot-halo/

I wrote:
I wonder if that make an Alcubiere warp drive more feasable between galaxies.
http://en.wikipedia.org/wiki/Alcubierre_drive

Actually I ment a Bussart ramjet, it needs matter.
http://en.wikipedia.org/wiki/Bussard_ramjet