07+SPACE+AND+DISTANCES

= 3.1 The Milky Way = = 3.2 and 3.3 Galaxy =
 * === Our solar system is located in the outer reaches of the Milky Way Galaxy, which is a spiral galaxy.[[image:http://www.gifanimations.com/GA/Image/Animations/Aliens/Alien-blue.gif width="40" height="40" caption="alien-blue"]] ===
 * === The Milky Way Galaxy contains roughly 200 billion stars.Most of these stars are not visible from Earth[[image:http://t2.gstatic.com/images?q=tbn:ANd9GcSVXDsRj-K7MmqnAJ0jVzEiAEDXUQb_6R51HRlc-TJc4AO24oQ3&t=1 width="240" height="306" align="right"]] ===
 * === Almost everything that we can see in the sky belongs to the Milky Way Galaxy. ===

= = == = 3.4 Sizes = > > > > > > > >
 * === A galaxy can contain many millions of stars, held together by the force of gravity. ===
 * === There are lots of galaxys, many we dont even know about ===
 * === There are three types of galaxy's spiral, eliptical and perculiar ===
 * === The universe contains all the galaxies, there are about 125 billion galaxies but only 3,000 are visible with our technology. ===
 * === The name 'galaxy' comes form the greek term kyklos galaktikos meaning milky circle from its appearance in the sky. ===
 * === The diameter of the earth is 12,756.32 kilometers, or 7,926.41 miles. ===
 * === The moon has a diameter of 2,159 miles (3,476 kilometers), which is about four times smaller than the diameter of Earth. ===
 * === The Sun is about 1,391,980 kilometres (864,938 miles) in diameter. ===
 * === The diameter of the milky way is 100,000 light years. but it is only 1000 light years thick. ===
 * === The diameter of the universe is always changing because its always expanding but it is still MASSIVE!! ===
 * === There are **9.4605284 × 1012 kilometres in a light year.** ===
 * === **The picture below shows the distance the planets are from the planets compared to how fast they travel:** ===
 * [[image:http://www.bbc.co.uk/schools/ks3bitesize/science/images/planet_speed_distances.gif width="516" height="382" caption="Graph showing the distance from the sun for each planet, and the speed in ms. As the planets get further from the sun, the speed reduces."]]