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25.1 Properties of Stars <br />
Constellation<br />An apparent group of stars originally named for mythical characters. There are 88 constellations dividi...
Binary Star<br />One of two stars revolving around a common center of mass under their mutual gravitational attraction.<br />
Light-year<br />The distance light travel in a year, about 9.5 trillion kilometers.<br />
Apparent Magnitude <br />The brightness of a star when viewed from Earth.<br />
Absolute Magnitude <br />The apparent brightness of a star if it were viewed from a distance of 32.6 light-years; used to ...
Main-Sequence Star<br />A star that falls into the main sequence category on the H-R diagram; this category contains the m...
Red Giant <br />A large, cool star of high luminosity; a star occupying the upper-right portion of the H-R diagram.<br />
Supergiant <br />A very large, very bright red giant star.<br />
Cepheid Variable <br />A star whose brightness varies periodically because it expands and contracts; a type of pulsating s...
Nova <br />A star that explosively increases in brightness.<br />
Nebulae<br />A cloud of gas and/or dust in space.<br />
Key Concept <br />Color is a clue to a star’s temperature.<br />
Key Concept<br />Binary stars are used to determined the star property most difficult to calculate its mass.<br />
Key Concept<br />The nearest stars have the largest parallax angles, while those of distant stars are too small to measure...
Key Concept <br />Three factors control the apparent brightness of a star as seen from Earth: how big it is, how hot it is...
Key Concept<br />A Hertzsprung-Russell diagram shows the relationship between the absolute magnitude and temperature of st...
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Earth science 25.1

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Transcript of "Earth science 25.1"

  1. 1. 25.1 Properties of Stars <br />
  2. 2. Constellation<br />An apparent group of stars originally named for mythical characters. There are 88 constellations dividing up the sky. <br />
  3. 3. Binary Star<br />One of two stars revolving around a common center of mass under their mutual gravitational attraction.<br />
  4. 4. Light-year<br />The distance light travel in a year, about 9.5 trillion kilometers.<br />
  5. 5. Apparent Magnitude <br />The brightness of a star when viewed from Earth.<br />
  6. 6. Absolute Magnitude <br />The apparent brightness of a star if it were viewed from a distance of 32.6 light-years; used to compare the true brightness of stars.<br />
  7. 7. Main-Sequence Star<br />A star that falls into the main sequence category on the H-R diagram; this category contains the majority of stars and runs diagonally from the upper left to the lower right on the H-R diagram.<br />
  8. 8. Red Giant <br />A large, cool star of high luminosity; a star occupying the upper-right portion of the H-R diagram.<br />
  9. 9. Supergiant <br />A very large, very bright red giant star.<br />
  10. 10. Cepheid Variable <br />A star whose brightness varies periodically because it expands and contracts; a type of pulsating star.<br />
  11. 11. Nova <br />A star that explosively increases in brightness.<br />
  12. 12. Nebulae<br />A cloud of gas and/or dust in space.<br />
  13. 13. Key Concept <br />Color is a clue to a star’s temperature.<br />
  14. 14. Key Concept<br />Binary stars are used to determined the star property most difficult to calculate its mass.<br />
  15. 15. Key Concept<br />The nearest stars have the largest parallax angles, while those of distant stars are too small to measure.<br />
  16. 16. Key Concept <br />Three factors control the apparent brightness of a star as seen from Earth: how big it is, how hot it is, and how far away it is.<br />
  17. 17. Key Concept<br />A Hertzsprung-Russell diagram shows the relationship between the absolute magnitude and temperature of stars.<br />
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