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's synodic period of orbit around the earth is 29.53 days, roughly. This is the length of time it takes for the moon to reach the same position <i>relative to the sun</i> as the starting position. So the synodic period reflects the cycle of moon phases.