【女】Thank you. It's great to see so many of you interested in this series on "Survival inOuter Space." Please excuse the cameras - we're being videotaped for the local TV stations.
Tonight I'm going to talk about the most basic aspect of survival - the space suit. Whenmost of you imagine an astronaut, that's probably the fist thing that comes to mind, right?Well, without spaces suits, it would not be possible for us to survive in space. For example,outer space is a vacuum - there's no gravity or air pressure; without protection, a body wouldexplode. What's more, we'd cook in the sun or freeze in the shade - with temperatures rangingfrom a toasty 300 degrees above to a cool 300 degrees below zero Fahrenheit.
The space suit that NASA has developed is truly a marvel. This photo enlargement here isa life-size image of an actual space suit worn by astronauts on the last space shuttle mission.This past is the torso - it's made of seven extremely durable layers. This thick insulationprotects against temperature extremes and radiation. Next is what they call a "bladder" ofoxygen - that's an inflatable sac, filled with oxygen, to simulate atmospheric pressure. Thisbladder presses against the body with the same force as the Earth's atmosphere at sea level.The innermost layers provide liquid cooling and ventilation. Despite all the layers, the suit isflexible, allowing free movement so we can work.
Another really sophisticated part of the space suit is the helmet. I brought one along toshow you. Can I have a volunteer come and demonstrate?