Chapter 8 Glossary Terms

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Chapter 8 Glossary Terms
2013-01-10 19:34:22
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The glossary terms for chapter 8 of ON Science 9
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  1. Electromagnetic Radiation
    Radiation consisting of electromagenetic waves that travel at the speed of light (such as visible light, radio waves, Xrays).
  2. Refracting telescope
    A telescope that uses a lens to collect the light from an object.
  3. Reflecting Telescope
    A telescope that uses a mirror to collect the light from an object.
  4. Satellite
    An artificial object or vehicle that orbits Earth, the moon or other celestial bodies; also a celestial body that orbits another body of larger size ie. the Moon is Earth's natural satellite.
  5. Orbiters
    Observatories that orbit other celestial objects.
  6. Solar Nebula Theory
    The theory that describes how stars and planets form from contracting, spinning disks of gas and dust.
  7. Star
    A celestial body made of hot gases, mainly hydrogen and some helium.
  8. Nebula
    An interstellar cloud of gases such as hydrogen, helium and other ionized gases.
  9. Protostar
    A hot condensed object at the center of a nebula.
  10. Nuclear Fusion
    The process of energy production in which hydrogen nuclei combine to form helium nuclei.
  11. Photosphere
    The surface layer of the Sun.
  12. Sunspot
    An area of strong magnetic fields on the photosphere.
  13. Solar wind
    A stream of fast moving charged particles ejected by the sun into the solar system.
  14. Solar Flare
    A large brightening on the surface of the sun which is known to release energy.
  15. Importance of the Sun
    The sun is our supply of daylight which is required for photosynthesis and to keep our planet warm.
  16. Luminosity
    A star's total energy output per second; its power in joules per second.
  17. Absolute magnitude
    The magnitude of a star that we would observe if the star were 32.6 light years from Earth.
  18. Spectroscope
    An optical instrument that produces a spectrum from a narrow beam of light, and usually projects the spectrum onto a photographic plate or a digital detector.
  19. Spectral Lines
    Certain specific wavelengths within a spectrum characterized by lines spectral lines identify specific chemical elements.
  20. Hertzsprung-Russel (H-R) Diagrams
    A graph that compares the properties of stars.
  21. Main Sequence
    A narrow band of stars on the H-R diagram that runs diagonally from left (bright, hot stars) to the lower right (dim, cool stars); about 90 percent of stars, including the Sun, are in the main sequence.
  22. White Dwarf
    A small, dim, hot star.
  23. Supernova
    A massive explosion in which the entire outer portion of the star is blown off.
  24. Neutron Star
    A star so dense that only neutrons can exist in its core.
  25. How low-mass stars evolve
    How intermediate-mass stars evolve
    How high-mass stars evolve
  26. Black hole
    The remnant of a supernova explosion with a gravitational field so strong that nothing can escape its pull.