Last week there was a successful test firing of the X51a WaveRider scramjet. This test was done during a simulation of a Mach 5 velocity.
Boeing is the maker of the X51a. Update of the X-51a from May 27th 2010 here
Burt Rutan’s take on the EADS Space Plane
…and to inspire the imagination….Mars once had two very large oceans.