1. The Big Bang – Formation of The Universe

2. The universe Definition- all of space and everything in it

3. The Big Bang Theory The Big Bang is the theory of how the universe was formed. Scientists believe that our universe began with a big explosion of gas and dust in space. This explosion is called the Big Bang. All of this matter and energy in space was concentrated in a single particle - the Primeval Atom - before the Big Bang. They believe this explosion occurred about 15 billion years ago. Since that time, the universe has been expanding (getting bigger and more spread out).

4. It was made up of metals, gases, and dust All the pieces scattered and formed different things in our universe

5. animation of the formation of the universe: http://resources.schoolscience.co.uk/PPARC/b ang/bang.htm http://resources.schoolscience.co.uk/PPARC/b ang/bang.htm

6. Galaxy A Galaxy is a cluster of hundreds of billions of stars. Our galaxy is the Milky Way. The Milky Way is a spiral galaxy. Our solar system is on a spiral arm of the Milky Way. light year- distance light travels in one year. (light travels at a speed of 300,000km/sec

7. Types of Galaxies 1. Elliptical 2. Spiral 3. Irregular

8. Elliptical galaxies Huge; contain stars, gas, and dust Held together by gravity Round-to-oval shape Mainly old stars are present

9. Huge; contain stars, gas, and dust Held together by gravity Pinwheel shape Young and old stars are present Spiral galaxies

10. Irregular galaxies No regular shape May show signs of a disk and/or a bulge; halo is present Usually rich in gas and dust Young and old stars are present

11. The Milky Way Galaxy

12. Further Observations Using the observations that the galaxies are moving away from us and computing the distance to these galaxies shows that 1. The Universe is expanding in ALL directions. 2. The Expansion is seen from ALL directions. 3. There is NO center of the universe.

13. Cosmological Redshift

14. BRAINPOP!! http://www.brainpop.com/science/space/milk yway/ http://www.brainpop.com/science/space/milk yway/

15. Our Solar System Our solar system consists of the sun, planets, dwarf planets (or plutoids), moons, an asteroid belt, comets, meteors, and other objects. The sun is the center of our solar system; the planets, over 61 moons, the asteroids, comets, meteoroids and other rocks and gas all orbit the Sun.asteroidscomets meteoroidsSun

16. Composition of our solar system: Sun: 99.85% Planets: 0.135% Comets: 0.01% ? Satellites: 0.00005% Minor Planets: 0.0000002% ? Meteoroids: 0.0000001% ? Interplanetary Medium: 0.0000001% ? Minor Planets

18. BRAINPOP!! http://www.brainpop.com/science/space/sola rsystem/ http://www.brainpop.com/science/space/sola rsystem/