Chapter25

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Chapter25

  1. 1. Chapter 25 Section 1: STARS
  2. 2. Patterns of stars: Constellations <ul><li>Ancient cultures used mythology or everyday items to name constellations. </li></ul>
  3. 3. Modern Astronomy Studies 88 Constellations
  4. 4. Some constellations are not visible all year because Earth revolves around the Sun.
  5. 5. Circumpolar constellations in the northern sky appear to circle around Polaris and are visible all year.
  6. 6. Circumpolar Constellations
  7. 7. Star Magnitude <ul><li>Absolute magnitude: measure of the amount of light a star actually gives off. </li></ul><ul><li>Apparent magnitude: measure of the amount of a star’s light received on Earth </li></ul>
  8. 8. Space Measurement <ul><li>Astronomers measure a star’s parallax </li></ul><ul><ul><li>The shift in its position when viewed from 2 different angles. </li></ul></ul>
  9. 9. Distance is measured in light-years <ul><li>Light year: distance light travels in a year. </li></ul>
  10. 10. Star Properties <ul><li>Color indicates temperature </li></ul><ul><ul><li>Hot stars are blue-white </li></ul></ul>
  11. 11. Cool stars look orange or red

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