Earth is the homeworld of the Human race, located in the Sol System. It is the third planet of the system, orbiting at precisely 1 AU from its parent star, a G2-V Main Sequence star known as Sol, or simply The Sun. Contrary to popular belief, Earth is not the Federation's headquarters - it is Mars.
Exposure to. vertical vibrations in the 5-10 Hz range generally causes resonance in the thoracic-abdominal system, at 20-30. Hz in the head-neck-shoulder system, and at 60-90 Hz in the eyeball. When vibrations are attenuated in the. body, its energy is absorbed by the tissue and organs. The muscles are important in this respect. Vibration. leads to both voluntary and involuntary contractions of muscles, and can cause local muscle fatigue, particularly when the vibration is at the resonant-frequency level.
Autonomic nervous system malfunction. Fainting is most commonly caused by a temporary malfunction in the autonomic nervous system. This type of fainting is sometimes known as neurally mediated syncope. The autonomic nervous system is made up of the brain, nerves and spinal cord.