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  1. electromagnetic radiation
    radiarion consisting of electromagnestic waves that travel at the speed of light (such as visible light, radio waves, and X rays)
  2. refracting telescopes
    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 (human-made) object or vehicle that orbits Earth, the Moon, or other celestial bodies; also, a celestial body that orbits another of larger size (for example, the Moon is Earth's natural satellite)
  5. ethics
    the set of moral principles and values that guide a person's activities and help him or her decide what is wrong
  6. orbiters
    a spacecraft designed to go into orbit, especially one not intended to land
  7. solar nebula theory
    the theory that describes how stars and planets form from contracting, spinning disks of gas and dust
  8. star
    a celestial body made of hot gases, mainly hydrogen and some helium
  9. nebula
    a vast cloud of gas and dust, which may be the birthplace of stars and planets
  10. protostar
    hot condensed object at the center of the nebula
  11. nuclear fusion
    the process of energy production in which hydrogen nuclei combine to form helium nuclei
  12. photosphere
    the surface layer of the sun
  13. sunspot
    an area of strong magnetic fields on the photosphere
  14. solar wind
    a stream of fast moving charged particles ejected by the sun into the solar system
  15. solar flare
    • a brief eruption of intense high-energy radiation from the sun's surface
    • associated with sunspots and causing electromagnetic disturbances on the earth, as with radio frequency communications and power line transmissions.
  16. importance of the sun
    • finding sufficient food
    • providing ourselves with adequate shelter
    • powers wind and currents
    • drives all weather from soft summer winds to gigantic hurricanes
    • provides energy required for photosynthesis
  17. luminosity
    a star's total energy output per second; its power in joules per second (j/s)
  18. absolute magnitude
    the magnitude of a star that we would observe if the star was placed 32.6 light years away from Earth
  19. spectroscope
    an optical instrument that produces a spectrum from a narrow beam of light, and usually projects the spectrum onto the photographic plate or a digital detector
  20. spectral lines
    certain specific wavelengths within a spectrum characterized by lines; spectral lines identify specific chemical elements
  21. Hertzspurg-Russell (H-R) diagram
    a graph that compares the properties of stars
  22. main sequence
    a continuous and distinctive band of stars that appears on plots of stellar color versus brightness
  23. white dwarf
    a small, dim, hot star
  24. supernova
    a massive explosion in which the entire outer portion of a star is blown off
  25. neutron star
    a star so dense that only neutrons can exist in the core
  26. blackhole
    a region of space having a gravitational field so intense that no matter or radiation can escape.
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2016-01-12 04:38:11
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