life cycle of a star

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Science Daily Starter April 27, 2008 • Label page – Creative Writing • Label page – Daily Starters April 28-May 2 – Your daily starter is to come…..

Author: lacey-hyche

Post on 10-May-2015




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The life and death of a star as needed to know by a 6th grader


  • 1.Science Daily Starter April 27, 2008
    • Label page
    • Creative Writing
  • Label page
    • Daily Starters April 28-May 2
    • Your daily starter is to come..

2. Science Daily Starter April 27, 2008

  • What is the first stage in the life cycle of a star?

3. Life Cycle of a Star Ms. Hyche 1 st , 2 nd , 6 thperiod Science 4. Nebulae

  • Nebulae
    • A nebulae is a cloud of gas and dust in outer space.
    • These clouds are often very large, spanning across many light years.
    • There are many different kind of nebulas in the sky

5. Nebulaes

  • Ring Nebulae
  • Double Lobed Nebulae

6. Other Nebulaes.


7. Life Cycle of Stars

  • Just like people, stars are born, grow old, and eventually die.
  • The difference is, stars exist for billions of years.

8. How do stars form?

  • They are born when clouds of gas and dust come together and become very hot and dense. (nuclear fusion)
  • As stars get older, they lose some of their material.
  • Usually this is a gradual change, but sometimes it happens in a big explosion.
  • Either way, when a star dies, much of its material returns to space.
  • There some of it combines with more gas and dust to form new stars.

9. Types of Stars

  • Determinded by size, mass, brightness, color, temperature, specturm, and age
  • Main-sequence stars, giants, supergiants, white dwarfs

10. Main-Sequence Stars

  • Second and longest stage
  • Energy generated in the core, and released
  • Size changes very little as long as there is a continuous supply of hydrogen atoms to fuse the helium atoms

11. Giants and Supergiants

  • Third stage
  • Star can become ared giant
    • A star that expands and cools once it uses its hydrogen
    • Star will shrink

12. Scale 13. White Dwarfs

  • Final stage
  • Size of the sun or smaller
  • White Dwarf
    • Small, hot star that is the leftover center of an older star

14. The Diagram That Did It!

  • In 1911, a Danish astronomer named Ejnar Hertzsprung compared the temperature and brightness of stars on a graph.
  • Two years later, American astronomer Henry Norris Russell made some similar graphs.

15. 16. 17. The Diagram That Did It

  • Although they used different data, they had similar results.
  • The combination of their ideas is now called the Hertzsprung-Russell, orH-R diagram .
    • TheH-R diagramis a graph showing the relationship between a stars surface temperature and its absolute magnitude.

18. 19. 20. Continued

  • The H-R-diagram has become a tool for studying the nature of stars.
  • It shows how stars are classified by temperature and brightness AND its a good way to illustrate how stars change over time.

21. As stars age.

  • Average stars (sun), become red giants and then white dwarfs
  • More massive stars may explode with such intensity that they become strange objects such as supernovas, neutron stars, pulsars, and black holes

22. Supernovas

  • Massive blue stars with short lives
  • Supernova
    • Gigantic explosion in which a massive star collapses.

23. Neutron Stars

  • Neutron star
    • A star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons
  • Pulsar
    • Spinning neutron star

24. 1987A 25. 1987A 26. Blackholes

  • Leftovers of a supernova that they collapse
  • Black hole
    • Object so massive and dense that even light cant escape its gravity

27. 28. Life Cycles

  • The life cycle of a star varies, depending on the mass of the star.
  • Higher mass stars develop more quickly than lower mass stars. Toward the end of their life, they also behave differently.

29. More on life cycles

  • Stars form inside a cloud of gas and dust called a nebula.
  • Gravity pulls gas and dust closer together in some regions of a nebula.
  • As the matter contracts, it forms a hot, dense sphere.
  • The sphere becomes a star if the center grows hot and dense enough for fusion to occur.

30. 31. 32. 33. 34. 35. 36. 37. Death of a Star

  • When a star begins to run out of fuel, its core shrinks and its outer portion expands.
  • Depending on its mass the star becomes either a red giant or a supergiant.
  • These evolve in very different ways.

38. Low or Medium Mass Star

  • Low or medium mass star
    • Red Giant
    • Planetary Nebula
    • White Dwarf
    • Black Dwarf

39. High Mass Star

  • High Mass Star
    • Supergiant
    • Supernova
    • Black hole (gravity so strong that nothing, not even light, can escape) or neutron star

40. In conclusion.

  • Nebulae
  • Main-Sequence Star
  • Giants or Red Giants
  • White Dwarfs
  • Supernovas, Neutrons, Blackholes

41. 42. 43. 44. 45. 46. 47.