Can you have zero gravity conditions on Earth..?
Gravity will always be there, but you can set up an arrangement where
you will appear to be weightless. Such an arrangement is in a plane that
flies up and swoops down so that its path is a circle standing on edge.
You will hang in the plane and appear to be weightless. What is
actually happening is that for a few seconds the plane is falling at the
same speed as you are so if you measured your weight on scales in the
plane, you would appear to weigh zero.
Zero gravity is impossible on earth. Actually, zero gravity is impossible anywhere. Gravity acts through millions of light-years, holding galaxy groups together, so there's no way that you can eliminate gravity this close to a major mass like the earth.
However - you CAN have a situation that is mathematically and physically equivalent to zero gravity, and that is free fall. Jump on a trampoline, you'll spend a few fractions of a second in free fall, which is just like zero-G. NASA does it with the Vomit Comet, which is a modified KC-135 aircraft that flies in parabolic paths to give astronauts-in-training a free fall experience.
Zero gravity is impossible on earth. Actually, zero gravity is impossible anywhere. Gravity acts through millions of light-years, holding galaxy groups together, so there's no way that you can eliminate gravity this close to a major mass like the earth.
However - you CAN have a situation that is mathematically and physically equivalent to zero gravity, and that is free fall. Jump on a trampoline, you'll spend a few fractions of a second in free fall, which is just like zero-G. NASA does it with the Vomit Comet, which is a modified KC-135 aircraft that flies in parabolic paths to give astronauts-in-training a free fall experience.
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