Chapter 8 Definitions

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Author:
ishanbhavsar
ID:
264287
Filename:
Chapter 8 Definitions
Updated:
2014-02-27 17:06:25
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Glossary Terms
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Chapter 8 Glossary Terms
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  1. Electromagnetic radiation definition
    radiation consisting of electromagnetic waves that travel at the speed of light(such as visible light, radio waves, and X rays)
  2. Refracting telescope definition
    a telescope that uses a lens to collect the light from an object
  3. Reflecting Telescope definition
    a telescope that uses a mirror to collect the light from an object
  4. Satellite Definition
    an artificial (human-made) object or vehicle that orbits Earth, the moon or other celestial bodies; also, a celestial body that orbits another body of larger size

    For Example: the moon is earths natural satellite
  5. Orbiters Definition
    observatories that orbit other celestial objects
  6. Solar nebula theory Definition
    the theory that describes how stars and planets were formed from contracting, spinning disks of gas and dust
  7. Star Definition
    a celestial body made of hot gases, mainly hydrogen and some helium
  8. Nebula Definition
    a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette
  9. Protostar Definition
    a hot condensed object at the centre of a nebula
  10. Nuclear Fusion Definition
    the process of energy production in which hydrogen atoms combine to form helium atoms
  11. Photosphere definition
    the surface layer of the sun
  12. Sunspot Definition
    an area of strong magnetic fields on the photosphere
  13. Solar Wind Definition
    a stream of fast-moving charged particles ejected by the sun into the solar system
  14. Solar Flare Definition
    a brief eruption of intense high-energy radiation from the sun's surface
  15. Importance of the Sun
    the sun is important to us because it powers most of our natural resources, and it heats our planet up.
  16. Luminosity Definition
    a star's total energy output per second
  17. Absolute Magnitude Definition
    the magnitude of a star that we would observe if the star were 32.6 light-years away from Earth
  18. Spectroscope Definition
    an optical instrument that produces a spectrum from a narrow beam of light, and usually projects the spectrum onto a photographic plate
  19. Spectral Lines Definition
    certain specific wavelengths within a spectrum characterized by lines; spectral lines specific chemical elements
  20. H-R Diagram Definition
    a graph that compared the properties of stars
  21. Main Sequence Definition
    a narrow band of stars on the H-R Diagram that runs diagonally from the upper left to the lower right; about 90 percent of stars including the sun are in the main sequence
  22. White Dwarf Definition
    a small, dim, hot star
  23. Super Nova Definition
    a massive explosion in which the entire outer portion of a star is blown off
  24. Neutron Star Definition
    a star so dense that only neutrons can only exist in its core
  25. How low-mass stars evolve
    Low-mass stars consume their hydrogen slowly over a period that maybe as long as a 100 billion years
  26. How intermediate-mass stars evolve
    Intermediate stars such as the sun consume their hydrogen faster then low mass stars
  27. How high-mass stars evolve
    high mass stars which consume fuel even faster then intermediate mass stars
  28. Black Hole
    the remnant of a supernova explosion with a gravitational field so strong that nothing can escape its pull (not even light)

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