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Progress 21, Supplies Docks at Station



SUBMITTED BY ARTHUR N1ORC - AMSAT A/C#31468
  
Progress With Equipment, Supplies Docks at Station

    04.26.06

A new un piloted Progress cargo carrier docked at the International 
Space Station at 1:41 p.m. EDT (5:41 UTC )Wednesday.

International Space Station The 21st Progress to visit the station has 
just over 2½ tons of equipment and supplies on board. Included in its 
5,040 pounds of cargo are more than 1,900 pounds of propellant, just 
over 100 pounds of air and oxygen, 661 pounds of water and almost 2,360 
pounds of dry cargo.

The new Progress also has on board some small crustaceans for a Russian 
scientific experiment called Aquarium. That experiment looks at 
stability of closed ecological systems in microgravity. It could provide 
information useful for lengthy human spaceflights.

Progress 21 docked at the aft port of the Zvezda Service Module. Station 
crew members, Expedition 13 commander Pavel Vinogradov and NASA Science 
Officer Jeff Williams, will open the new arrival's hatch later today. 
While they might sample some of the fresh food aboard the Progress, they 
will begin unloading the Progress on Thursday.

Its sister cargo carrier and predecessor at the station, Progress 20, 
will remain at the Pirs Docking Compartment until mid-June. P20, with 
its load of trash and surplus equipment from the station, will be 
deorbited and burn after entry into the Earth's

The Progress is similar in appearance and some design elements to the 
Soyuz spacecraft, which brings three crewmembers to the station, serves 
as a lifeboat while they are there and returns them to Earth. The aft 
module, the instrumentation and propulsion module, is nearly identical.

But the second of the three Progress sections is a refueling module, and 
the third, uppermost as the Progress sits on the launch pad, is a cargo 
module. On the Soyuz, the descent module, where the crew is seated on 
launch and which returns them to Earth, is the middle module and the 
third is called the orbital module.
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