Chromaffin cell. Chromaffin cells, also pheochromocytes, are neuroendocrine cells found mostly in the medulla of the adrenal glands (located above the kidneys) in mammals.
The Moon has no appreciable atmosphere. The sky is always black and the radiation from the Sun strikes with full force on the surface of the Moon. The lack of atmosphere produces temperature extremes on the Moon that range from -250 degrees F in the dark to +250 degrees F in the light.
The Moon Cycle. The term moon cycle (or lunar cycle) refers to the moon's continuous orbit around the earth. As the moon orbits the earth, its appearance (the phase) changes and thus gives us an indication of the moon's progress in the cycle (the age).