Spaceflight

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Outline of aerospace Satellites Human spaceflight Rockets Space Agencies

Docking demands matching velocities to a few centimetres per second — why so precise? What happens when a crewed capsule lands hundreds of kilometres off target? Why does mission control scrub a launch at T-minus nine minutes? Cosmic radiation on a Mars transit: what shielding is actually realistic? Launch abort systems: what happens in the first twenty seconds if the rocket fails? How is air and water recycled on a station that never resupplies for months? Why do astronauts spend two hours a day exercising just to keep their muscles? What does six months of weightlessness do to an astronaut's bones? How does a returning capsule survive re-entry and what is the entry corridor?

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