astronomy test

  1. What is astronomy?
    The study of the universe
  2. How was the Universe created?
    the big bang theory
  3. What is the Big Bang theory?
    A massive explosion occurred between 10-20 billion years ago.
  4. Ever since the big bang theory the universe has been...
  5. All galaxies are part of the...
  6. what is a galaxy?
    a collection of millions or billions of stars
  7. What are galaxies classified by?
  8. what are the different types of galaxies?
    spiral, elliptical, irregular
  9. what is the main type of galaxy?
  10. what type of galaxy is our milky way?
  11. where is the sun located in our galaxy ?
    on one of the spiral arms far from the galactic center
  12. our sun is an ________ sized star and a _______ aged star
    • average
    • middle
  13. how old is our sun estimated to be?
    4.5 billion years old
  14. the solar system includes...
    our sun, eight planets, comets, asteroids, meteoroids
  15. What are the order of the planets?
    mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, (pluto)
  16. what is in between mars and jupiter?
    an asteroid belt
  17. how did our star (sun) form?
    From a nebular cloud (composed of gas and dust)
  18. what was our sun before it was a star?
    a prostar
  19. what are terrestrial planets?
    the inner planets that are small and rocky
  20. what are gas giants?
    the outer planets that are large and gaseous
  21. what are comets made of?
    chunks of ice and dust
  22. what kind of orbit do comets revolve around the sun?
    an elliptical orbit
  23. what are asteroids?
    small and rocky objects that revolve around the sun
  24. what are meteoroids made of?
    chunk of rock or dust in space
  25. what do meteoroids come from?
    part of a comet or an asteroid
  26. what was the Geocentric theory?
    that the earth was in the center of our solar system
  27. what is the Heliocentric theory?
    that the sun is in the center of our solar system
  28. what keeps planets moving?
  29. what keeps planets in their orbit around the sun?
  30. as earth gets closer to the sun it moves...
  31. as earth moves further away form the sun it moves...
  32. what are stars born from?
    planetary nebula
  33. electromagnetic energy is radiated by...
  34. stars vary in their...
    size, mass, density, temperature and color
  35. what is the H-R diagram used for?
    to classify stars
  36. what is a ring (for a planet)?
    thin disk of small particles of rock and ice surrounding a planet
  37. what units of measurement would we use to measure the distances of our sun to the planets in our solar system?
    astronomical units
  38. which are the two largest planets?
    jupiter and saturn
  39. which planet is closest size to earth?
  40. what is a star life cycle determined by?
    the stars mass
  41. The medium sized star in our solar system is the...
  42. define glow
    to shine brightly
  43. a star that doesn't give off light is a...
    black dwarf
  44. a glowing ball of gas is a...
  45. what is the core of the star?
    the middle or center of the star
  46. what is a red giant?
    a large star that glows red
  47. define expand
    to grow larger
  48. What is the life cycle of a medium star?
    nebula, medium star, red giant, planetary nebula,white dwarf, black dwarf
  49. what is the life cycle of a huge star?
    nebula, huge star, red super giant, supernova, neutron star
  50. what is the life cycle of a giant star?
    nebula, giant star, red super giant, supernova, black hole
  51. which color star has the highest (hottest) surface temperature?
    blue stars
Card Set
astronomy test