One of the causes of nauseousness is that the brain is getting conflicting signals from the eyes and the ears. In the context of the above example, being in space means that your ears cannot determine orientation and motion very well but seeing that the Earth was rotating (and therefore realizing that you are actually moving) prompted the brain to be confused. On the one hand, your ears are saying that are you not moving. On the other hand, your eyes are saying that you are moving. Its thought that this conflict in signals prompts the brain to respond by inducing nauseousness to remove whatever "poison" that is causing the brain from being able to respond properly.
By the way, this is also the reason for most forms of motion sickness. Interesting side note: one tends to get carsick more easily if one sits in the rear versus the front. Sitting in the front, your vision tends to be more focused on the forward view whereas sitting in the back, one's field of view tends to be not focused on anything in particular. This results in your eyes telling your brain that you really aren't moving while the ears can detect the motion of the car and are telling your brain that you are moving.
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One of the causes of nauseousness is that the brain is getting conflicting signals from the eyes and the ears. In the context of the above example, being in space means that your ears cannot determine orientation and motion very well but seeing that the Earth was rotating (and therefore realizing that you are actually moving) prompted the brain to be confused. On the one hand, your ears are saying that are you not moving. On the other hand, your eyes are saying that you are moving. Its thought that this conflict in signals prompts the brain to respond by inducing nauseousness to remove whatever "poison" that is causing the brain from being able to respond properly.
By the way, this is also the reason for most forms of motion sickness. Interesting side note: one tends to get carsick more easily if one sits in the rear versus the front. Sitting in the front, your vision tends to be more focused on the forward view whereas sitting in the back, one's field of view tends to be not focused on anything in particular. This results in your eyes telling your brain that you really aren't moving while the ears can detect the motion of the car and are telling your brain that you are moving.
Small edit.
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