Choppers to snatch space capsule

In a harrowing feat high over the Utah desert two helicopter stunt pilots will try to snatch a floating space capsule that holds "a piece of the sun" and bring it safely down.

Practice runs have succeeded but they fear flubbing it on live television.

And that's entirely possible. The pilots rate it 8 or 9 on a difficulty scale of 10.

"It's like flying in formation with a giant floating jellyfish," says pilot Dan Rudert.

The stuntmen will be trying to hook the 180km Genesis capsule as it hurtles 120m a minute.

Inside it are fragile solar wind particles - so small they're invisible - that scientists hope will reveal clues about the origin of our solar system.