Why does metal stick together in space?

Metal sticks together in space because there is no air to keep them apart. On Earth, a thin layer of invisible gas covers every surface, stopping atoms from holding hands. In space, that layer vanishes, allowing the metal surfaces to cold weld instantly when they touch.

Imagine your face covered in a fuzzy towel. If you press your cheeks together under the towel, they don't really stick; the fabric keeps them separate. Now, imagine taking off the towel so your skin touches bare skin. That is what happens to metal on Earth versus space. On Earth, oxygen and moisture form an oxide layer like a tiny protective shield. When two pieces of steel touch in orbit, their atoms see each other clearly without that shield blocking them.

You might think metals need fire to melt and join, but in space, they can stick at room temperature. This process is called cold welding. Think about two clean blocks of clay pressed tightly together. The clay molecules link up across the boundary, becoming one solid piece. Metal atoms behave similarly in the vacuum of space. Without air molecules bouncing around to create a barrier, the atomic bonds form so strongly that breaking them apart requires almost as much force as snapping a fresh stick in half.

So, if you left two metal bars floating next to each other for a long time, they would likely fuse permanently. It is not magic; it is just physics working without its usual noisy neighbors to get in the way.