Tim+V+SS+General+Info

-- What is Gravity?
Gravity is a force which pulls everything to the centre of its origin, on Earth our gravity pull is quite strong compared to the other inner planets, the larger a planet the stronger its gravity pull. Gravity is created when a heavy mass is created and is big enough to bend space. Our space is like a giant rubber sheet, now imagine stretching a rubber sheet and putting a marble onto it. Nothing happens the sheet stays the same. Now imagine putting a medicine bowl on the sheet, this causes a bend or dimple on the sheet now when you put a marble next to this ball it will get pulled towards it into the crease. That medicine ball is like a planet and our universe is the rubber sheet, when something is big enough it will bend space and create gravity because of its density.

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The inner planets are the first 4 planets in our solar system (Mercury, Venus, Earth, Mars), and the outer planets are the final 4 (Jupiter, Saturn, Uranus, Neptune). One of the differences is, all of the inner planets are smaller and are solid, and the outer planets are all gas or liquid and are much larger, another thing special about the outer planets is that they will not be destroyed if the sun were to explode. The inner and outer planets are separated by the asteroid belt. Even though the inner planets are smaller they are heavier because they are solid and also move slower than the outer planets.=====

-- Why does the moon have phases?
The moons phase depends on the alignment of the sun and moon, so the moon has phases because of the suns glare blocking out the view of the moon. Depending on how far away the moon is from the sun, will vary its shape, which physically always stays the same but you cannot visually see it.Here is a chart of all of the phases and a diagram of the moons progression and changes through its 28 day cycle.