Multiple choice general knowledge science & technology

If two pieces of metal touch in space,they become permanently _____________ together?

  1. join

  2. stuck

  3. magnetize

  4. broke
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Two pieces of metal can become permanently stuck together in space through a phenomenon called cold welding. In the vacuum of space, there's no air or oxide layer between clean metal surfaces, allowing direct metallic bonding when they touch. On Earth, oxidation and contaminants prevent this. The effect requires very clean, smooth surfaces and was first observed with spacecraft components.

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