Which of the following statements about the celestial sphere is not true?
a. the celestial sphere does not exist physically.
b. when we look in the sky, the stars all appear to be located on the celestial sphere.
c. the earth is placed at the center of the celestial sphere.
d. the celestial sphere is another name for our universe.

 The correct answer is :   d. The "celestial sphere" is another name for our universe.

Explanation:  The celestial sphere is an ideal sphere without a defined radius, which has the same center as the terrestrial globe, where the stars move. The directions in which the celestial objects are found can be represented by means of the sphere.

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