"It's pretty amazing that I can watch, live on my computer, a man riding a balloon to the edge of space so he can jump out of it. #TheFuture," tweeted Wil Wheaton, who played on the iconic science-fiction series "Star Trek: The Next Generation."
"Felix Baumgartner is a boss," tweeted Jozy Altidore, a soccer player for the U.S. men's national team.
