Planet X Becomes Pluto

David B. (United States of America)
21 words 10 learners

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Full list of words from this list:

words only definitions & notes
  1. planet
    a celestial body that revolves around the sun
    Shaparelli was sure that he had found life on the planet Mars.
  2. astronomical
    relating to the branch of physics studying celestial bodies
    The International Astronomical Union named the new planet Pluto.
  3. orbit
    the path of a celestial body in its revolution about another
    Others say that its oblong orbit around the sun does not fit the pattern of planets.
  4. probe
    an exploratory action or expedition
    A space probe called "New Horizons" is scheduled to reach this farthest point in space after a nine-year journey.
  5. solar
    relating to the sun or utilizing the energies of the sun
    He spent the rest of his life trying to prove his theory.

    3 One of the secondary ideas which came from Lowell's observations was his theory that Planet X existed at the far edge of the solar system beyond the last known planet, Neptune.
  6. theory
    a belief that can guide behavior
    He spent the rest of his life trying to prove his theory.

    3 One of the secondary ideas which came from Lowell's observations was his theory that Planet X existed at the far edge of the solar system beyond the last known planet, Neptune.
  7. astronomy
    the branch of physics that studies celestial bodies
    1 Percival Lowell became interested in astronomy in the late 1800's.
  8. mar
    cause to become imperfect
    Shaparelli was sure that he had found life on the planet Mars.
  9. horizon
    the line at which the sky and Earth appear to meet
    A space probe called "New Horizons" is scheduled to reach this farthest point in space after a nine-year journey.
  10. telescope
    a magnifier of images of distant objects
    He concluded that the lines he saw on the planet through his telescope were canals.
  11. procedure
    a particular course of action intended to achieve a result
    If he found anything in the pictures that seemed to shift in a pattern, he believed he would find proof of Planet X. After following this procedure for a lengthy period, he was ready to announce his observations.

    5 On February 18, 1930, Clyde Tombaugh announced to the world his discovery of a new planet.
  12. gravity
    the force of attraction between all masses in the universe
    First, it must orbit the Sun. Secondly, it must be big enough for gravity to make it into a round ball.
  13. sustained
    continued at length without interruption or weakening
    He believed that it sustained itself by using water from the Martian icecaps to irrigate land.
  14. photograph
    a picture taken with a camera or phone that shows people or scenes
    He died before his theory could be proved.

    4 Clyde Tombaugh was hired by the Lowell Observatory to study the possibilities of a Planet X. He began by taking photographs of the stars.
  15. studied
    produced or marked by conscious design or premeditation
    He studied the findings of Shaparelli.
  16. sustain
    lengthen or extend in duration or space
    He believed that it sustained itself by using water from the Martian icecaps to irrigate land.
  17. pursuit
    the act of following in an effort to overtake or capture
    When Shaparelli began to lose his eyesight, Percival Lowell took over his pursuit of information.
  18. shift
    move very slightly
    If he found anything in the pictures that seemed to shift in a pattern, he believed he would find proof of Planet X. After following this procedure for a lengthy period, he was ready to announce his observations.

    5 On February 18, 1930, Clyde Tombaugh announced to the world his discovery of a new planet.
  19. journey
    the act of traveling from one place to another
    A space probe called "New Horizons" is scheduled to reach this farthest point in space after a nine-year journey.
  20. period
    an amount of time
    If he found anything in the pictures that seemed to shift in a pattern, he believed he would find proof of Planet X. After following this procedure for a lengthy period, he was ready to announce his observations.

    5 On February 18, 1930, Clyde Tombaugh announced to the world his discovery of a new planet.
  21. object
    a tangible and visible entity
    Some scientists have taken to the theory that Pluto and its moon, Charon, were formed when a larger Pluto was struck by another object in space just about its size.
Created on 一月 9, 2011 (updated 一月 9, 2011)

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