Other Sciences

6th -

8thgrade

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STAAR Category 3: Earth and Space Part 1

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  • 1. Multiple Choice
    2 minutes
    1 pt
    The Milky Way galaxy is described as a disk of stars orbiting a central point on the disk. Which of these best explains why people on Earth cannot see the entire shape of the Milky Way? 
    Earth is a part of this galaxy.
    Many more stars exist outside the galaxy.
    The stars in the center of the galaxy are extremely small. 
    The center of the galaxy consists of a dense cluster of stars.
  • 2. Multiple Choice
    2 minutes
    1 pt
    Image
    The diagram below shows four phases of the moon as it revolves around Earth. A student builds a model based on this diagram. The student uses foam balls to represent the moon and Earth and a flashlight to represent the sun. The student should shine the flashlight on the model of Earth from Position ____.
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  • 3. Multiple Choice
    2 minutes
    1 pt
    An object will continue moving in a straight line unless it is acted on by an unbalanced force. Which of the following best explains Earth's motion?
    There is no unbalanced force acting on Earth because space is empty and nothing touches Earth.
    The gravitational force pulling Earth towards the sun is equal and opposite to the force pulling the sun towards Earth, so there is no unbalanced force acting on Earth.
    The sun moves in an elliptical orbit around Earth, and the sun's gravity pulls Earth along.
    Earth moves in an elliptical orbit around the sun because the gravitational force of the sun attracts Earth.
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