Original sentence: A study released in July 2009 by the 45th Space Wing of the US Air Force concluded that an abort 30–60 seconds after launch would have a ~100% chance of killing all crew, due to the capsule being engulfed until ground impact by a cloud of 4000°F solid propellant fragments, which would melt the capsule's nylon parachute material.BY NASA's own standards (maintained by the United States Congress), this is an unacceptable risk, thus the future of the Ares I is currently uncertain.The next best alternative is the Atlas series of launch vehicles, which employ liquid fuel
Edited sentence: A study released in July 2009 by the 45th Space Wing of the US Air Force concluded that an abort 30–60 seconds after launch would have a ~100% chance of killing all crew, due to the capsule being engulfed until ground impact by a cloud of 4000 °F solid propellant fragments, which would melt the capsule's nylon parachute material.However, NASA's study showed the crew capsule would fly beyond the more severe danger