I read these random facts related to space on a local airline magazine. Thought provoking.
1. Cold welding. When two pieces of same metal touche, they bond together permanently because the atoms cannot recognize that they belong to two separate pieces. This won’t happen on earth because of water and air particles.
2. Space is silent. Sound waves require atmosphere in order to travel. Radio waves can be heard however.
3. One Venus day is equal to one earth year. The only planet to rotate backwards… may have suffered huge impact billions of years ago, making it go upside down!