Tag: ISS

Soyuz undocking at ISS delayed

10:58 pm

The scheduled return of three astronauts on a Soyuz spacecraft has been delayed tonight because of a malfunction in the docking port.

Update: The return to Earth has definitely been canceled for tonight. The problem was caused when latches on the Soyuz, designed to secure it safely to ISS, refused to release on command. As of 12:43 am the plan was to recycle and try to land on Friday evening.

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ISS’s life expectancy

1:29 pm

Engineers are reviewing the life expectancy of the International Space Station, in light of the desire of politicians to keep it operating through the 2020s. Intriguing quote:

Airlines and airplane contractors commonly inspect aircraft for such fractures, but with the space station out of reach more than 200 miles up, engineers rely on complex models to predict their growth in orbit.

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Astronauts lose about half their muscle power on long space flights

9:15 pm

Though this only confirms what the Russians learned on Mir, scientists have determined that long periods in weightlessness cause a significant loss in muscle strength. More research like this — to both study the problem as well as possibly solve it — is exactly what we need to do on ISS. Key quote:

Damage caused to the tissue is such that it is equivalent to a 30- to 50-year-old crew member’s muscles deteriorating to that of an 80-year-old. Despite in-flight exercise, the report warns that the destructive effects of extended weightlessness to skeletal muscle poses a significant safety risk for future manned missions to Mars and further afield.

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Tour of ISS, part 4

8:01 pm

An evening pause: Mike Finke’s tour of ISS continues in the Progress freighter, moves through the Zarya functional cargo module into the Zvezda service module at the aft end of the station, showing us a Russian crew cabin and the station’s main bathroom facilities.

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ISS tour continues, part 3

8:01 pm

An evening pause: Astronaut Mike Finke’s tour of ISS continues, taking us through the Unity module and into the Russian part of the station, showing us the inside of a Soyuz lifeboat, the Zarya functional cargo module, the Piers docking module/airlock, and ending looking into the hatch of a Progress freighter.

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Repair strategy for Wednesday spacewalk

10:40 pm

NASA engineers are working out a strategy for the next spacewalk, now tentatively scheduled of Wednesday, to continue repair efforts on the International Space Station. The new plans call for the astronauts to close several valves on the leaking coolant line while ground controllers lower pressure on the line, then drain the excess ammonia from it. This will hopefully allow the astronauts to disconnect the line from the pump without spewing ammonia all over the place, and then proceed with the removal of the failed pump.

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ISS tour, part 1

8:01 pm

An evening pause: We talk a lot about the International Space Station. Why not take a tour? In this January 2009 video, part 1 of 4, astronaut Mike Finke starts us out at the docking port used by the shuttle and takes us through the Harmony and Kibo modules. Along the way he gives a great view out the port side of the station.

You can see the remaining parts of Mike’s tour by clicking through, or you can wait until I post them over the next week.

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First spacewalk to replace pump module

2:38 pm

The first spacewalk to replace the failed pump module on ISS is finished, and it did not go as well as hoped. The astronauts had problems removing one of four cooling system ammonia lines to the old pump. They eventually succeeded, actually using a hammer to lightly tap the quick-disconnect latch free. They then had to seal an ammonia leak coming from the problematic line. These issues caused them to run out of time, preventing them from removing the old pump and installing the new one. It is expected they will pick up where they left off on the next spacewalk, presently scheduled for Wednesday.

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The failure of the past and a hint of the future

9:40 pm

The coolant system failure on the International Space Station this weekend and the upcoming spacewalks being planned to fix it is a dramatic and fascinating story, capturing the interest of the general public while causing some news pundits to express fear and dread about science fiction scenerios of disasters in space.

The situation is hardly that death-defying. The station’s cooling systems have a lot of redundancy, all of which are being used to good effect. Moreover, the spacewalk repair to install a replacement pump module, though challenging, is exactly the kind of thing the astronauts have been trained to do. I expect them to do it with few problems. I would be far more surprised if they have serious difficulties and fail to get it done.

What this failure foreshadows, however, is the future on ISS. As the years pass and systems age, » Read more

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