EARTH AND LIFE SCIENCE: origin of the solar system.pptx

EARTH AND LIFE SCIENCE: origin of the solar system.pptx

1. Origin of the Solar System

2. Lego bricks and Minecraft blocks allow us to build different structures by simply combining together or removing pieces.

3. Like Lego bricks and Minecraft blocks, some theories that explain the origin of the universe use the same concept of combining and breaking off celestial materials.

4. How did the combination of cosmic materials and breaking apart of a star form the solar system?

5. Let’s Recall … What are the components of our solar system? What is beyond our solar system? SOLAR SYSTEM 8 PLANETS 5 DWARF PLANETS 1 STAR At least 290 planetary moon 1.4 million asteroids 4000 comets Terrestrial planets Jovian planets

6. ACCRETION Accretion is a major process believed to have a major role in the formation of planets. It is the gradual accumulation of matter which results to increase in size.

7. How did the Solar System form? Origin of the Solar System NEBULA THEORY ENCOUNTER THEORY

8. ENCOUNTER THEORY NEBULAR THEORY

9. ENCOUNTER THEORY NEBULAR THEORY According to the Nebular Theory, the solar system originated from a nebula. It is the widely accepted view about the formation of the solar system some 4.5 billion years ago.

10. ENCOUNTER THEORY NEBULAR THEORY A nebula is defined by NASA as giant cloud of gas and dust in space. This interstellar cloud of dust contains hydrogen, helium and other ionized gases. Dusty discs surrounding nearby young stars

11. ENCOUNTER THEORY NEBULAR THEORY The formation of the solar system from a nebula occurs in three major steps: cloud collapse , (2) formation of protoplanetary disk , and (3) growth of planets. Major Steps in the Formation of the Solar System

12. ENCOUNTER THEORY NEBULAR THEORY Major Steps in the Formation of the Solar System

13. ENCOUNTER THEORY NEBULAR THEORY

14. ENCOUNTER THEORY NEBULAR THEORY Major Steps in the Formation of the Solar System

15. ENCOUNTER THEORY NEBULAR THEORY Major Steps in the Formation of the Solar System

16. ENCOUNTER THEORY NEBULAR THEORY Major Steps in the Formation of the Solar System

17. ENCOUNTER THEORY NEBULAR THEORY Major Steps in the Formation of the Solar System

18. ENCOUNTER THEORY NEBULAR THEORY Major Steps in the Formation of the Solar System

19. ENCOUNTER THEORY NEBULAR THEORY

20. ENCOUNTER THEORY NEBULAR THEORY

21. ENCOUNTER THEORY NEBULAR THEORY

22. ENCOUNTER THEORY NEBULAR THEORY

23. ENCOUNTER THEORY NEBULAR THEORY

24. TIDAL THEORY PLANETESIMAL THEORY ENCOUNTER THEORY FORMS OF ENCOUNTER THEORY 1 2 It proposes that a passing star termed as intruding star nearly collided with the protosun . The massive gravitational pull of the intruding star causes the protosun to eject filaments of material which then condensed into planetesimals. This theory describes how Earth started from a solid mass smaller than its present size .

25. TIDAL THEORY PLANETESIMAL THEORY ENCOUNTER THEORY FORMS OF ENCOUNTER THEORY 1 2 TWO Proponents of the Planetesimal Theory

26. PLANETESIMAL THEORY Proponents:

27. Thomas Chrowder Chamberlin proposed that accretion of minute solid particles created planets and their moons rather than by gaseous or liquid material condensation. PLANETESIMAL THEORY Proponents:

28. Forest Ray Moulton provided the mathematical calculations to Chamberlin’s idea. Proponents: PLANETESIMAL THEORY

29. Drawbacks of PLANETESIMAL THEORY PLANETESIMAL THEORY Planetesimal theory is no longer accepted today due to the fact that hot material from the sun expands and dissipates rather than contract. In addition, the force from the passing star will pull dust and gases far away from the sun, that they would not be able to form the planets in the solar system.

30. TIDAL THEORY PLANETESIMAL THEORY ENCOUNTER THEORY FORMS OF ENCOUNTER THEORY 1 2 It explains that the solar system formed as a result of a near collision between a passing star and the sun. This theory proposes that the hot gas from the passing star condensed into planets instead of condensing into planetesimals.

31. TIDAL THEORY Proponents:

32. TIDAL THEORY Proponents: James Jeans an English physicist and astronomer

33. TIDAL THEORY Proponents:

34. TIDAL THEORY Proponents: Harold Jeffreys an English mathematician and astronomer in 1918.

35. Drawbacks of TIDAL THEORY TIDAL THEORY One problem of the tidal theory is that the hot material from either star cannot contract. Thus, planets will not form. STARS COLLISION