[Az Joe]

Is orbiting the earth a sport? They face greater G-forces and more heat.

[al_c]

Is orbiting the earth a sport? They face greater G-forces and more heat.

Apples to oranges, Joe.

For about 10 to 15 minutes ... then they're in 0-gravity. Also, there's no competition ... nobody's trying to get to space before them. NASCAR drivers are in a race to a finish line (there's your competition angle) and in constant heat and oppressive Gs (comparable to fighter pilots) for up to 3 hours.