‘‘‘If I Forget Thee, O Earth . . . ’’’ starts off by introducing Marvin, a ten-year-old boy. Marvin and his father walk quickly through a large building, which includes a greenhouse and an observatory, then enter an airlock chamber, where they get into a scout car and drive outside. Before now, Marvin has only seen the outside in photographs and on television. At this point, Clarke has not revealed where they are, but he starts to give clues that they are not on earth as soon as Marvin and his father leave the airlock. The sun is moving across a completely black sky, a sight not possible from earth due to earth’s atmosphere. When the sky is black on earth, it is because the sun has set, in which case the moon comes out. Also, Marvin has read about the classic rhyme ‘‘Twinkle, twinkle, little star’’ in one of his father’s books and is surprised to see that the stars do not twinkle. When stars are viewed by the unaided human eye from within earth’s atmosphere, the turbulence in the higher ranges of the atmosphere causes the stars to look like they are twinkling, an effect known as scintillation. The absence of this effect is one more clue from Clarke that Marvin and his father are not on earth.
They drive at one hundred miles an hour in their car, which has balloon tires. This is different from most cars on earth, which have tires made of rubber. They pass a mine and drive down the steep edge of the plateau that contains their...
(The entire section is 691 words.)
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