Why do two pieces of metal come into contact in space and fuse together, but not on Earth?

{"info":{"title":{"content":"为何两块金属在太空中接触，会熔接在一起，地球不能？","en":"Why do two pieces of metal come into contact in space and fuse together, but not on Earth?"},"description":{"content":"亲爱的读者朋友好~在地球上，金属不容易粘在一起，因为空气里的氧气、氮气和其他东西都把金属保护得好好的。可是，太空就不一样...","en":"Hello dear readers and friends~ On the earth, metals are not easy to stick together, because the oxygen, nitrogen and other things in the air protect the metals well. But space is different..."}},"items":[]}