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Yes, when in outer space, two pieces of metal can become permanently stuck to each other if they touch directly, with absolutely nothing between them.
This is known as “cold welding.” «t In our atmosphere, oxygen molecules cover metal surfaces, preventing ’ 5 contact. But in the vacuum of space, rubbing can scrape off this oxygen coat. This allows cold welding to occur and can cause space-probe instruments to malfunction.
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For example, in 1991, the Galileo spacecraft’s antenna (above in the artist’s drawing here) never fully opened.
It was later determined that some of the ribs of the umbrella-like antenna, which were locked down for launch, remained closed because they had cold welded together after liftoff.
Cold welding is a very interesting phenomena. Essentially the surface atoms 'see' each other on contact (since there is no oxide layer) and just join together covalently as if they were always one piece of metal. This can happen on earth as well with some of the less reactive metals. In fact, this is how wire wrapping works to create a solder free connection that is stronger than solder in most cases. It also typically has a lower resistance which is preferred.
Yes dear is right
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Nice article :) Richard Feynman told it in a simple way: "The reason for this unexpected behavior is that when the atoms in contact are all of the same kind, there is no way for the atoms to “know” that they are in different pieces of copper. When there are other atoms, in the oxides and greases and more complicated thin surface layers of contaminants in between, the atoms “know” when they are not on the same part."