Space Chapter 8

The flashcards below were created by user lharttrup on FreezingBlue Flashcards.

  1. what is electromagnetic radiation?
    • radiation consisting of electromagnetic waves that travel at the speed of light(such as visible light, radio waves, and x rays)
    • Image Upload
  2. what is a refracting telescope?
    • a telescope that usues a lens to collect the light from an object
    • Image Upload
  3. what is a reflecting telescope?
    • a telesope that uses a mirror to collect the light from an object 
    • Image Upload
  4. what is a 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 earths natural satellite)
    • Image Upload
  5. what are orbiters?
    observatories that orbit other celestial objects

    Image Upload
  6. what is the solar nebula theory?
    Image Uploadthe theory that describes how stars and planets form from contracting, spinning disks of dust
  7. what is a star?
    • a celestial body made of hot gases, mainly hydrogen and some helium
    • the sun is the closest star to earth
  8. what is a protostar?
    Image Uploada hot, condensed object at the center of a nebula
  9. what is nuclar fusion?
    the process of energy production in which hydrogen nuclei combine to form helium nuclei
  10. what is a photosphere?
    • the surface layer of the sun
    • Image Upload
  11. what is a sunspot?
    • an area of strong magnetic fields on the photosphere
    • Image Upload
    • it is cooler than the rest of the sun and looks a different shade!
  12. what is solar wind?
    • Image Uploada stream of fast moving charged particles ejected by the sun into the solar system (solar flare)
    • -eventually aurora borealis forms (when it enters the earths atmosphere it is considered solar wind)
  13. what is a black hole?
    • the remnant of a supernova explosion with a gravitational field so strong that nothing can escape its pull
    • Image Upload
  14. what is luminosity?
    a stars total energy output per second; its power in joules per second (J/s)
  15. what is a nebula?
    a vast cloud of gas and dust, which may be the birthplace of stars and planets
  16. what is absolute magnitude?
    • the magnitude of a star that we would observe if the star were placed 32.6 light-years from Earth
    • the absolute magnitude of the sun is about 4.7
  17. what is a spectroscope?
    • an optical instrument that produces a spectrum from a narrow beam of light, and usually projects the spectrum onro a photographic plate or digital detector
    • Image Upload
  18. what are spectral lines?
    Image Uploadcertain specific wavelengths within a spectrum characterized by lines; spectral lines identify specific chemical elements
  19. what is a Hertzsprung-Russel (H-R) diagram?
    • a graph that compares the properties of stars
    • Image Upload
  20. what is a main sequence?
    • a narrow band of stars on the H-R digram that runs diagonally from the upper left (bright, hot stars) to the the lower right (dim, cool stars); about 90% of stars, including the sun, are in the main sequence
    • Image Upload
  21. what is a white dwarf?
    • a small, dim, hot star
    • Image Upload
  22. what is a supernova?
    Image Uploada massive explosion in which the entire outer portion of a star is blown off
  23. what is a neutron star?
    Image Uploada star so dense that only neutrons can exist in the core
  24. what are solar flares?
    • can occur where there are complex groups of sunspots.
    • magnetic fields explosively eject intense streams of charged particles into space.
    • usually result in beautiful auroras
  25. what is  the importance of the sun?
    • the sun is needed for all life on earth.
    • the suns energy drives most processes on earth like sufficient food and shelter.
    • solar energy powers the winds and ocean currents
    •  drives all weather
    • drives photosynthesis (provides oxygen)
  26. how do low-mass stars evolve?
    • red dwarfs have less mass than the sun
    • consume their hydrogen slowly over a period as long as 100 billion years
    • lose significant mass
    • all that remains is a fain white dwarf
    • takes tens of billions of years for them to cool down
    • Image Upload
  27. how do intermediate mass stars involve?
    • the sun is an intermediate mass star
    • consume their hydrogen over about 10 billion years
    • the core collapses when hydrogen is used up
    • as this happens, temperature increases and outer layers expand and are cooler, so they turn red
    • turn into red giants, eventually the sun will be a white dwarfImage Upload
  28. how to high mass stars dissolve?
    • have 12 or more solar masses
    • consume fuel faster than intermediate mass stars
    • die more quickly and mre violently
    • the core heats up to higher temperatures, heavier elements from, star expands into supergiant
    • iron forms in core, the core collapses violently, shock waves travel through star
    • outer portion explodes (supernova)
    • Image Upload
Card Set:
Space Chapter 8
2013-01-09 21:44:01
Space Chapter

Space Chapter 8
Show Answers: