In dictionaries:
Cygnus X-1
A placename.
hercules x-1
Hercules X-1 (Her X-1), also known as 4U1656+35, is a moderately strong X-ray binary source first studied by the Uhuru satellite.
vela x-1
a pulsing, eclipsing high-mass X-ray binary system, associated with the Uhuru source 4U 0900-40 and the supergiant star HD 77581.
Scorpius X-1
an X-ray source located roughly 9000 light years away in the constellation Scorpius.
Bell X-1
The (Bell Model 44) a rocket engine–powered aircraft, designated originally as the XS-1, and was a joint National Advisory Committee for Aeronautics–U.S. Army Air Forces–U.S. Air Force supersonic research project built by Bell Aircraft.
Submarine X-1
a 1968 British war film loosely based on the Operation Source attack on the German battleship Tirpitz in 1943.
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