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