To be sure it reaches the necessary speeds, the X-43A will be attached to a booster rocket and ride piggy back on a B-52 to 24, 000 feet.

BBC: Mach 10 scramjet prepares for launch

Jeff Greason, the president of XCOR Aerospace, a company that makes rocket engines for suborbital craft, worries that the X Prize, with its attached conditions, may not in practice lead to the right sort of craft being built.

ECONOMIST: Lift-off for enterprise | The

Bryan Singer ("X-Men") is attached as executive producer.

CNN: New 'Twilight Zone' series in the works

He said that an x-ray conducted later "revealed the presence of a metallic object with wires attached to it".

BBC: India