Houston: Two space walkers sheepishly lost a spatula in orbit on Wednesday.
But NASA engineers didn't mind much, because the two accomplished their main task of testing a method to apply emergency patches to a shuttle heat shield — and then some.
Discovery space walkers Piers Sellers and Michael Fossum improved on the method of applying a special mixture to repair the reinforced carbon leading edges of a space shuttle, using mock-ups in a suitcase in Discovery's payload bay.
A crack allowed fiery gases to penetrate space shuttle Columbia's reinforced carbon wing during re-entry to Earth's atmosphere in 2003, destroying that shuttle and killing its seven astronauts.
The same peanut butter-like repair goo was used a year ago in a first test of the system, with mixed results. That test produced many bubbles that could allow killer heat to penetrate on re-entry.
This time, initial results showed that some bubbles formed, but they didn't join to become big, dangerous ones, said lead spacewalk officer Tomas Gonzalez-Torres.
The key difference lay in pancakes, Gonzalez-Torres said.
Fossum and Sellers used a technique similar to flipping pancakes. They spread a thin layer of the mixture and kept flipping it, explained Gonzalez-Torres.
At first, astronauts said the bubbles kept forming, but they were able to keep them to a minimum.
"It's bubbling," Sellers said at one point. "It's growing. It's scary-looking."
The goo was messy, spattering the space walkers to the extent that Sellers told Fossum, "Mike, you look like a panda. You've got a few little spots."
There was only one thing missing from the space walk-Sellers' spatula.
It flew overboard, off the right side of the shuttle's payload bay.
"No sign of the spatula. I think it's gone, gone, gone," Sellers said of the kitchen appliance, 14 inches long and two inches wide.
When Sellers was nearing the finish of his extended seven-hour, 11-minute space walk, mission control teased him by making him count his spatulas.
He still had five left, from a total of six. It is rare for space walkers to lose such a tool, but "it is no hazard to us," Gonzalez-Torres said.
Nonetheless, military monitors of space debris were notified of the new hazard to track.
In three space walks this flight, Sellers and Fossum logged 21 1/2 hours outside, with Sellers moving up to fourth on the all-time NASA space walking list.
By the end of his journey outdoors, Sellers had had enough, saying it was "time for dinner and a shower."
The entire crew of Discovery will get a day off Thursday before starting to wind up the mission, undocking from the international space station on Saturday and planning to return to Earth on Monday.
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