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Question
I'm a high school student in Pakistan. I just want to know the weight of an astrobiologist in space if his/her weight is 80 kg on earth.
The Space Station and other satellites orbiting the Earth are in a condition of "free fall". If you were in the Space Station, you and the Station would be falling together around the Earth. Since you and your surroundings are moving together, the apparent gravity (the downward force exerted on you here on the surface of the Earth) is essentially absent. This is called "microgravity", since apparent gravitational forces are generally down at a level of about 1 millionth of that on the Earth surface. Of course, gravity is still present in space, just the same as on the surface of the Earth, but you would not feel it because both you and your surroundings are in free fall.
David Morrison
NAI Senior Scientist
June 18, 2003
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