1. When astronauts leave footprints on the moon, they stay there forever! There is no wind to blow them away.
2. As there is less gravity on Mars, a person weighing 100kg on earth would only weigh 38kg there!
3. Uranus is the only planet rotating on its side in a barrel-like manner.
4. Venus is the only planet that spins backwards compared with the others.
5. As there is no gravity to pull them under, humans become a little taller in space.