1. Footprints and tyre tracks left behind by astronauts on the moon will stay there forever as there is no wind to blow them away.


2. Because of lower gravity, a person who weighs 100kg on earth would only weigh 38kg on the surface of Mars.


3. 64 moons orbit Jupiter .


4. The Martian day is 24 hours 39 minutes and 35 seconds.


5. NASA's Crater Observation and Sensing Satellite (LCROSS) declared that they have found evidence of significant amounts of water on the Earth's Moon .


6. The Sun makes a full rotation once every 25-35 days


7. Venus is the only planet that spins backwards relative to the other planets.


8. The force of gravity can sometimes cause comets to tear apart.


9. It is thanks to the Sun and our own moons gravity that we have high and lowtides.


10. Our moon is moving away from Earth at a rate of 4cm (1.6 Inches) per year!