Human to scale BE-4engine R-180 engine Atlas V rocket Boeing’sproposedcrew capsulewould transportas many as sevenpassengers tothe InternationalSpace Station.The CST-100 is designed to sit atop an Atlas V, but the Delta IV rocket and Elon Musk’s Falcon 9 are also options. 191 ft United Launch Alliance, a collaboration of Boeing and Lockhheed Martin, usesAtlas V rockets to send satellites, military payloads and science instruments into orbit. RD-180 engineThe motor currently used in the Atlas V is the Russian- made RD-180, which for political reasons might not be available in the future. BE-4 engineBased on Blue Origin’s BE-3 rocket engine, the BE-4 will be fueled by liquid oxygen and liquefied natural gas. Full-scale test-ing will begin in 2016; the first flight on an Atlas V is expected in 2019. UAL plans to phase out Russian engines for the Atlas V and work with Blue Origin on its BE-4 engine, which has been in development for three years. ATLAS V CHANGING ENGINES The Atlas V is one of NASA’s primary choices as it makes plans to begin launching people into space again. If that happens, the boostcould be coming from a Bezos company. FUTURE MANNED MISSIONS

SOURCE: United Launch Alliance, Blue Origin. GRAPHIC: Patterson Clark and Alberto Cuadra - The Washington Post. Published Sept. 17, 2014.