Why Do Metals Bond in Space? Investigating the Casimir Effect

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The discussion centers around the phenomenon where two metals of the same type can stick together in space, attributed to cold welding or the Casimir effect. Cold welding occurs when two clean metal surfaces come into contact in a vacuum, allowing them to bond without the need for heat or additional materials. The Casimir effect, a quantum phenomenon, also plays a role in the attraction between objects at a microscopic level. It's noted that this bonding can happen with any two objects, not just metals of the same type.
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I was drinking a bottle of tea the other day, and I noticed the cap had a claim that two metals of the same type will stick together in space. Why is this?

Edit: "Why" do metals...

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Or to a Casimir effect.

Even if it doesn't require two pieces of the same metal, actually any two objects will do.
 

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