Patterns of Stars in Constellations Hardly Change in Appearance Over

question 13

Multiple Choice

Patterns of stars in constellations hardly change in appearance over times of even a few thousand years.Why?

• A)Stars are fixed and never move.
• B)Stars move,but they move very slowly-only a few kilometers in a thousand years.
• C)Although most stars move through the sky,the brightest stars do not,and these are the ones that trace the patterns we see in the constellations.
• D)The stars in our sky actually move rapidly relative to us-thousands of kilometers per hour-but are so far away that it takes a long time for this motion to make a noticeable change in the patterns in the sky.
• E)Stars within a constellation move together as a group,which tends to hide their actual motion and prevent the pattern from changing.

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