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Twinkle, Twinkle, Little Star

Twinkle, Twinkle, Little Star. BrainPOP : Life Cycle of Stars. What are stars?. Giant balls of gas that undergo nuclear fusion. Nuclear fusion is when the nuclei of two atoms join together to make a bigger nucleus and release energy. Composition (what it is made of) Size

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Twinkle, Twinkle, Little Star

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  1. Twinkle, Twinkle, Little Star BrainPOP: Life Cycle of Stars

  2. What are stars? Giant balls of gas that undergo nuclear fusion. Nuclear fusion is when the nuclei of two atoms join together to make a bigger nucleus and release energy.

  3. Composition (what it is made of) • Size • Color (temperature) • Brightness

  4. Find it on pg.93! Composition Stars are made up of mostly two gases, which ones are they?

  5. Size Supergiant or Giant Main Sequence Dwarf

  6. Thecolorof a star indicates its temperature.

  7. The Sun Our Sun is a main sequence, yellow star. Sun Song Its not the biggest OR the hottest in the universe!

  8. Brightness The brightness of a star depends on both the size and temperature of the star. But, how bright it APPEARS to us depends on how far it is from Earth and how bright it truly is.

  9. We can measure a star’s brightness in two ways: Apparent Magnitude Absolute Magnitude How bright a star actually is. (depends on How bright a star appears from Earth. (depends on star’s distance from Earth) Stars can appear brighter or dimmer depending on theirdistancefrom Earth.

  10. Which headlights are brighter? Why?

  11. In Class Example

  12. Exit Slip: Stars 1. What 5 characteristics are used to classify stars? 2. What can the color of a star tell you about it? 3. Which color star is hottest? 4. What size and color is our Sun? 5. Stars are made of mostly which two gases?

  13. Hertzsprung-Russell Diagram

  14. Over 90% of all stars (including our Sun) are main sequence stars.

  15. OMG, when is the sun going to die?!? The Sun’s estimated life is 10 billion years… AND…. The sun is halfway through its life!

  16. Characteristics of Stars Worksheet Answer # 1-5

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