Quantcast
Get breaking news alerts via email

Click here to manage your alerts
Astronauts make rare Christmas Eve spacewalk
First Published Dec 24 2013 08:04 am • Last Updated Dec 24 2013 08:04 am

Cape Canaveral, Fla. • Two space station astronauts ventured out on a rare Christmas Eve spacewalk Tuesday, hoping to wrap up urgent repairs to a cooling system.

It was the second spacewalk in four days for U.S. astronauts Rick Mastracchio and Michael Hopkins, and only the second Christmas Eve spacewalk in NASA history.

Join the Discussion
Post a Comment

NASA ordered up the spacewalks to revive a critical cooling loop at the International Space Station. All nonessential equipment had to be turned off when the line conked out Dec. 11, and many science experiments halted.

Mastracchio and Hopkins removed a faulty ammonia pump during Saturday’s outing. On Tuesday, they worked to install a new pump 260 miles above the planet.

"It’s like Christmas morning opening up a little present here," Mastracchio said as he checked his toolkit.

Mission Control in Houston was in a festive mood during Tuesday’s spacewalk. Tabletop Christmas trees, Santa dolls and red Santa caps decorated the desks.

"It is Christmas Eve ... and in this holiday way of giving, we’re giving you a spacewalk today," said commentator Rob Navias.

NASA’s only previous Christmas Eve spacewalk occurred in 1999 during a Hubble Space Telescope repair mission.

But NASA’s most memorable Christmas Eve was back on Dec. 24, 1968. Apollo 8 astronauts read from Genesis, the first book of the Bible, as they orbited the moon on mankind’s first lunar flight.

Space station managers considered waiting until January for the repair spacewalks, so an unmanned rocket could blast off with supplies from Virginia. But flight controllers were unable to patch the cooling line by remote control, and the orbiting outpost was considered in too vulnerable a state to put off the spacewalking repairs. The delivery mission was bumped, instead, to January.


story continues below
story continues below

A bad valve in the ammonia pump caused the breakdown.

Another team of spacewalking astronauts installed that pump just three years ago, and engineers are perplexed as to why it didn’t last longer. NASA hopes to salvage it in the years ahead.

The 2010 replacement required three spacewalks because of the difficulty in removing pressurized ammonia fluid lines. This time, NASA reduced the pressure and the task was simplified, allowing the astronauts to get ahead Saturday. Although three spacewalks were scheduled this time around, Mastracchio and Hopkins’ advance work allowed NASA to squeeze everything into two, barring any problems Tuesday.

The second spacewalk was supposed to take place Monday, but was delayed a day to give Mastracchio time to switch to another suit. He inadvertently hit a water switch in the air lock at the end of Saturday’s excursion, and a bit of water entered his suit, making it unusable this week.

During the rest of the spacewalk, however, the suits remained dry. Last July, an astronaut almost drowned when water from his suit’s cooling system flooded his helmet. Makeshift snorkels and absorbent pads had been installed in the suits as a precaution.

A Moscow-led spacewalk, meanwhile, is set for Friday. Two Russian crew members will install new cameras and fresh experiments outside.

———

Online:

NASA: http://www.nasa.gov/mission—pages/station/main/index.html



Copyright 2014 The Salt Lake Tribune. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Top Reader Comments Read All Comments Post a Comment
Click here to read all comments   Click here to post a comment


About Reader Comments


Reader comments on sltrib.com are the opinions of the writer, not The Salt Lake Tribune. We will delete comments containing obscenities, personal attacks and inappropriate or offensive remarks. Flagrant or repeat violators will be banned. If you see an objectionable comment, please alert us by clicking the arrow on the upper right side of the comment and selecting "Flag comment as inappropriate". If you've recently registered with Disqus or aren't seeing your comments immediately, you may need to verify your email address. To do so, visit disqus.com/account.
See more about comments here.
Staying Connected
Videos
Jobs
Contests and Promotions
  • Search Obituaries
  • Place an Obituary

  • Search Cars
  • Search Homes
  • Search Jobs
  • Search Marketplace
  • Search Legal Notices

  • Other Services
  • Advertise With Us
  • Subscribe to the Newspaper
  • Login to the Electronic Edition
  • Frequently Asked Questions
  • Contact a newsroom staff member
  • Access the Trib Archives
  • Privacy Policy
  • Missing your paper? Need to place your paper on vacation hold? For this and any other subscription related needs, click here or call 801.204.6100.