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If you look carefully at the stars each night, you'll eventually notice that some of the brightest ones move very slowly relative to the "fixed" stars. Of course these "wandering" stars are not stars at all; each one is a ...

Today's LessonCATEGORY: Problem Vocabulary


  • A planet  is one of the nine large round objects (including the earth) that move around the sun, or any such object that moves around a star.

    The planets  most easily seen at night are:

    Venus (the brightest star-like object in the sky and only seen in the evening or in the morning; second planet from the sun)

    Mars (the red planet; 4th from the sun)

    Jupiter (the largest planet; 5th from the sun)

    Saturn (the planet best known for its beautiful rings; 6th from the sun)

    Be careful:
    We often use the expression "THE planet"  (singular) to talk about the earth.
  • planet  は、太陽の周りをまわっている大きな9つの天体(地球を含む)、または、太陽系以外でも恒星の周りをまわっている天体、つまり、惑星のことです。






    単数形で、THE planet  と言うと、地球のことをさすことがよくあります。


  1. The planets  change their positions in the sky every night.  
  2. Do you think there is life on other planets?
  3. Pluto is the planet  farthest from the sun.
  4. I think we should learn to take better care of our own planet  before we start traveling to other ones.
  5. The movie "Planet  of the Apes" is a science fiction classic. They even made four sequels to it.
  6. One of my favorite pieces of classical music is Gustav Holst's "The Planets".
  7. It's hard to believe that dinosaurs actually walked the planet  long ago.
  8. There are only a few hundred of this species left on the planet.  It's highly endangered.

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