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The Soyuz TMA spacecraft is composed of three elements attached end-to-end -- the Orbital Module, the Descent Module and the Instrumentation/Propulsion/Service Module. The crew occupies the central element, the Descent Module. The other two modules are jettisoned prior to re-entry. They burn up in the atmosphere, so only the Descent Module returns to Earth.
The Orbital Module provides the crew with extra living space during the trip to the station. It contains systems vital to rendezvous and docking with the station's Pirs Docking Compartment or other port: a docking mechanism, a hatch and rendezvous antennas. Once the Soyuz departs, the Orbital Module is no longer needed, so it is jettisoned about three hours after undocking.
A secondary guidance, navigation and control system in the Descent Module enables the crew to maneuver the vehicle after the Instrumentation/Propulsion Module has been jettisoned. The Soyuz commander can pilot the module using a rotational hand controller that manages the firing of eight hydrogen peroxide thrusters on the vehicle's exterior. This system is deactivated 15 minutes before landing, when the parachutes are deployed.
The Dragon spacecraft is capable of carrying up to 7 passengers to and from Earth orbit, and beyond. It is the only spacecraft currently flying that is capable of returning significant amounts of cargo to Earth, and is the first private spacecraft to take humans to the space station.
#BigganPiC #Astronaut #Soyuz #Dragon_Spacecraft #Educational #Science #Astronaut_Return_To_Earth
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