powered? is travelling for, how is it owered? . ., ., , ., powered? we have iron engines. you are throwing powered? we have iron engines. you are throwing particles powered? we have iron engines. you are throwing particles at powered? we have iron engines. you are throwing particles at one - powered? we have iron engines. you are throwing particles at one side i are throwing particles at one side and it accelerates you in the other direction we have ion engines. it is firing particles out of one side. think about a rocket engine. the fire particles out one way and you accelerate the other way. the acceleration is about the equivalent of a couple of £1 coins in the end of a couple of £1 coins in the end of my finger. the advantage of an ion, it s a very slow burning, long duration engine. i ion, it s a very slow burning, long duration engine. ion, it s a very slow burning, long duration engine. i don t understand, ion? how are duration engine. i don t understand, ion? how
explosion. starkly contrasting a report from a russian state news agency saying none of the recovered bodies of passengers show evidence of explosive impact. tonight, cnn has learned, despite that report, u.s. government experts still aren t ruling out the possibility of a bomb on board. even as they weigh other scenarios. what could cause a catastrophic event. many things. history of fatigue cracks discovered after maintenance repairs have been done, planes where the skin has disintegrated flying over oceanic routes than catastrophic failure, issues about cargo hold, issues on engines. reporter: experts say the security at sharm el sheikh airport has to be investigated. how rigorous is security. the airport has multiple layers of security, initially upon arriving at the airport driveway, and then prior to check-in and upon check-in in t. self-. as any airport in the world, there are a number of ways to get a bomb aboard and whether