The first night in stead when I was vagrant off to sleep, recalled one Apollo astronaut, I suddenly realized that I had lost track of ... my arms and legs. For all my
mind could tell, my limbs were not there. However, with a conscious command for an arm or leg to move, it mighty off reappeared -- only to disappear again when I
Another astronaut from the Gemini computer programme reported waking in the dark during a committal and seeing a disembodied glow-in-the-dark tick off floating in front of him.
Where had it come from? He realized moments later that the watch was around his own wrist. Another astronaut reported a strange experience when he woke up
one day in orbit. As he opened his eye the room was rotating around him!
In space the vestibular system doesnt sense the familiar whiff of gravity. The foundation can suddenly seem topsy-turvy. Consider, for example, up and down. On
Earth we always come which way is up because gravity tell us. Sensors in the inside ear, which are part of the bodys vestibular system, can feel the pull of gravity.
They signal the brain with information about our bodys orientation. These sorts of mismatches between what the eyes see and what the body feels can trigger a
detects the motion of the car but the eyes -- staring at a rascal filled with unmoving words -- do not.
Cyclic malady and vomit up are characteristic. They may be preceded by yawning, hyperventilation, salivation, pallor, profuse cold-blooded sweating, and somnolence.
Aerophagia, dizziness, headache, general discomfort, and fatigue may also occur. Once nausea and vomiting develop,
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