When the rocket you are about to ride has 3.9 million pounds of thrust under the seat, it’s comforting to have an exit strategy should something go wrong.
The private company SpaceX recently had a successful test of a launch abort system as it moves closer to having manned flights on its manifest.
Astronauts inside a Dragon spacecraft can be propelled a third of a mile away from the rocket in five seconds in the event of an emergency. SpaceX already has had seven successful unmanned cargo missions to the International Space Station and hopes to start carrying astronauts into space by 2017.