1. AIM: What are The Parts of the Solar System

2. Vocabulary Satellite Planet Sun vs Star Solar System Galaxy Meteor, Meteorite Asteroid

3. Telescope

4. Model of Solar System

5. Objects in a Solar System a star - the Sun planets, which go around the Sun satellites, which go around planets smaller objects such as asteroids and comets

6. Satellites Natural – moons Manmade - satellites

7. Weather Mapping Communication Defense War Satellite Radio

8. The Moon The Moon is the natural satellite of the Earth. It orbits the Earth but no-one built it or launched it into space. Gravitational forces between the Moon and the Earth keep the Moon in orbit.

9. JUPITER’S MOONS

10. Artificial Satellites Some satellites are used to collect information about the planets and stars. The Hubble Space Telescope can see further into space than telescopes based on the ground. Its view is not blocked by clouds and it doesn't have to wait for night-time. However, it is difficult and expensive to launch and maintain.

11. Space Probes Space probes do not orbit the Earth Instead, they travel to other planets to collect scientific information. People have been to the Moon, but it would take too long to send people to other planets. Some space probes go into orbit around other planets, some land on them, and some even journey out of the solar system.

12. Asteroids Small objects which orbit the Sun Mostly between Mars and Jupiter Perhaps a planet which never formed

13. Asteroid Belt

14. Comets 900 comets have been identified About 200 have regular observed orbits Frozen ice, gasses, dust

15. Facts about Comets nucleus: relatively solid and stable, mostly ice and gas dust tail: up to 10 million km long composed of smoke- sized dust particles ion tail: as much as several hundred million km long composed of plasma and caused by interactions with the solar wind. Comets are invisible except when they are near the Sun.

16. Meteor Showers Meteor shower sometimes occur when the Earth passes thru the orbit of a comet. Some occur with great regularity: Perseid meteor shower occurs every year between August 9 and 13 when the Earth passes thru the orbit of Comet Swift- Tuttle. Comet Halley is the source of the Orionid shower in October.

17. Heliocentric Model People used to think that the Earth was at the center of the universe We now know that the Sun is at the center of the solar system, Earth and other planets go around it. We say that the planets are in orbit around the Sun This is the Heliocentric Model

18. Model of Solar System

19. What Keeps the Solar System Together? All objects have a force that attracts them towards each other. This is called gravity. Newton’s First Law

20. Gravity and the solar system Gravitational forces between the Sun and planets keep the planets moving in orbit around the Sun. Without these forces, the planets would fly off into deep space. Their orbits are slightly squashed circles called ellipses.

21. What is a Glaxay Our galaxy contain is the Milky Way Has over 100 billion stars (suns) The nearest galaxy is Andromeda is about 2-3 million light years distant.

22. This light may have taken 13 billion years to arrive at Earth