Original sentence: It is one of very few known interstellar spacecraft proposals that could be constructed entirely with today's technology.Proposed interstellar spacecraft using nuclear pulse propulsion include Project Orion and Project Longshot.Using miniature nuclear bombs as fuel, Orion would be able to reach a velocity of 10% of the speed of light
Edited sentence: However, interstellar travel would only be possible using advanced derivatives of the design with cruising speeds of 8%-10% C.Orion is one of the very few known interstellar spacecraft proposals that could be built entirely with existing technology.Proposed interstellar spacecraft using nuclear pulse propulsion include Project Orion, which used nuclear bombs as propellant, and Project Longshot, which used inertial confinement fusion explosions.Versions studied during the project had exhaust velocities of 20-30 km/sec, far too low to achieve reasonable interstellar cruising speeds