As the moon revolves around the earth, it also rotates on its axis. why is it that the same side of the moon is always visible from earth? a. the speed of the moon's rotation keeps the same side always facing earth. b. the earth's gravity attracts one side of the moon more than the other. c. that side of the moon only faces away from earth during the daytime. d. the moon does not have a day and night cycle.

A. The speed of the Moon's rotation keeps the same side always facing Earth.

Explanation:

Earth has one natural satellite - the moon. The same side of moon is always visible from the Earth because period of rotation around its axis and revolution around the earth are almost same. Moon rotates about its axis  and around the earth in about 28 days. The speed of the Moon's rotation keeps the same side towards the Earth.

Thus, correct option is A.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

e/c, where e is its total energy