Answers

2015-03-06T17:38:43+05:30
The astronaut carry a gas cylinder (o2) because of no avability of o2in the ( no atmosphere ) so its simple to breathe in they need o2
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2015-03-06T18:37:55+05:30
They carry cylinders containing oxygenated air because in space there is no o2 at all .but o2 is essential for sustaining life as we all know.
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