[ He's seen much more outlandish — people with multiple, piercing optics where eyes should be, walking and speaking around without throats, with the skin of crocodiles and made out of gold — that the smoke doesn't even register. ] Gravitational force equivalent. Earth is equivalent to 1 g. 4 to 6 g is 4 to 6 Earth's worth of gravity suddenly weighing on ya. Forces all the blood down your body, dryin' up your brain. So you faint — G-force induced loss of consciousness, or g-LOC.

Don't need space travel, just acceleration. [ Winks. ] I race cars.