The ACT Science Test: Space Science Review

The ACT Science Test will test your understanding of the methods and procedures of scientific experimentation, your ability to analyze scientific information, and your ability to interpret and make inferences about data. The Science Test will not directly test your recall of specific facts or vocabulary. However, familiarity with basic terms and concepts in various scientific disciplines will help ensure that you understand the information presented in passages, charts, and graphs. To help you prepare, we've compiled fundamental terms from each of the major scientific disciplines covered on the exam.
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Full list of words from this list:

words only definitions & notes
  1. orbit
    the path of a celestial body in its revolution about another
  2. astronomy
    the branch of physics that studies celestial bodies
  3. eclipse
    the phenomenon when one celestial body obscures another
  4. lunar
    of or relating to or associated with the moon
  5. solar
    relating to the sun or utilizing the energies of the sun
  6. nebula
    an immense cloud of gas and dust in interstellar space
  7. supernova
    a star that explodes and becomes luminous in the process
  8. axis
    a straight line through a body or figure
  9. galaxy
    a collection of star systems
  10. corona
    the outermost region of the sun's atmosphere
  11. luminosity
    the quality of emitting or reflecting light
  12. quasar
    a starlike object that may send out radio waves
  13. vacuum
    the absence of matter
  14. wane
    decrease in phase
  15. zenith
    the highest point of something
  16. nadir
    the point below the observer directly opposite the zenith
  17. stellar
    being or relating to or resembling or emanating from stars
  18. pulsar
    a degenerate neutron star that emits polarized radiation
  19. perigee
    the nearest point in an orbit around the Earth
  20. apogee
    the farthest point in an orbit around the Earth
  21. observatory
    a building equipped to view astronomical phenomena
  22. elliptical
    rounded like an egg
  23. gravity
    the force of attraction between all masses in the universe
  24. asteroid
    a small celestial body composed of rock and metal
  25. meteor
    a mass that enters earth's atmosphere, becoming incandescent
Created on Mon Dec 21 15:49:33 EST 2020 (updated Mon Dec 21 15:58:02 EST 2020)

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