Chapter 8 glossary terms

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Chapter 8 glossary terms
2013-01-10 14:37:30

Chapter 8 glossary terms for Mrs. Day
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  1. Electromagnetic radiation
    Radiation consisiting of electromagnetic waves that travel at the speed of light(such as visable light, radio waves, and X rays)
  2. Refacting 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 artifical (human made) object or vehicle that orbits earth, the moon or other celestial objects; also, a celestial body of larger size (for example, the moon is earths natural satellite)
  5. Orbiters
    Observatories that orbir another other celestial objects
  6. Solar nebula theory
    The theory that describes how stars and planets form form contracting, spinning disks of gas and dust
  7. Star
    A celestial body made of hot gases, mainly hydrogen and some helium
  8. Nebula
    A vast cloud of gas and dust which may be the birthplace of stars and planets
  9. Prostar
    A hot condensed object in the centre of a nebula
  10. Nuclear fusion
    The process of energy production in which hydrogen nuclei combine to form helium
  11. Photosphere
    The surface layer of the sun
  12. Sunspot
    The layer 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
    When the charged particle from the sun colide with the Earth's upper atmosphere, spectacular auroras can result (Northern lights)
  15. Inportance of the sun
    The sun is needed for all life on earth, the suns energy also drives most processes on earth that suport our daily activities like finding sufficent food and providing for ourselves with adequate shelter
  16. Luminosity
    A star's total energy output per second; its power in joules per second (J/s)
  17. Absolute magnitude
    The magnitude of a star that we would observe if the star was 32.6 light years away 
  18. Spectroscope
    An optical instrument that produces a spectrum from a narrow beam of light, and usually projects the spectrum onto a photo graphic plate or a digital detector
  19. Specular lines
    Certain specific wavelines within a spectrum characterized by lines; spectral lines identify specific chemical elements
  20. Hertzsprung-Russell (H-R) diagram
    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 the upper 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. Super nova
    A massive explosion in which the entire outer portion of a star is blown off
  24. Neutron star
    A star so dence that only neutrons can exist in its core
  25. How low-mass stars evolve
    Low mass stars evolve as they lose there significant mass they evaporate becoming dark embers. which will take billions of years to ocure
  26. How intermidiate-mass stars evolve
    These stars consume their hydrogen faster than low-mass stars and as the core contracts the temperature increases and the core begins to expand. And as the layers expand it is called a red giant, eventually the sun will become a white dwarf in about 5 billion years
  27. How low-mass stars evolve
    These stars consume their fuel even faster than the intermidiate-mass stars, these stars die more quickley and more violently. When the core heats up to much higher temperature. Heavier elements formed by fusion make the star expand to a superfiant, iron will eventually form in the core and since iron cannot release energy through fusion the star collapses violently forming a supernova
  28. Black hole
    The remnant of a supernova explosion with a gravitational field so strong that nothing can escape its pull