SpaceX set to launch ‘used rocket’
Could anybody here comment on the differences between spacex's engine, and the engines on the space shuttle?I was under the impression that SpaceX was trying to make the first re-usable rocket stage, but I've recently found out that that isn't true.  The space shuttle already holds that title.I'm also kindof curious why they decided to go with a vertical-landing-design, instead of putting some wings on it and having it glide home like the shuttle did.  Is that a weight-concern?  Aerodynamics, mabye, but couldn't the wings be articulated in the same way that the landing legs are right now?(I will admit some ignorance in this field.  I'm definitely a fan, but I'm definitely not a historian or a rocket scientist)